Disclosure Schedule Of Financial Data For Company Reportable Business Segments And Product Lines [Abstract] Disclosure - Schedule of Financial Data for Company Reportable Business Segments and Product Lines [Abstract] Business Segments Segment Reporting Disclosure [Text Block] Text Block [Abstract] Long-Term Debt And Capital Lease Obligations Schedule of Capitalization [Table Text Block] Components Of Net Carrying Amount Of Convertible Notes Schedule Of Components Of Net Carrying Amount Of Convertible Notes Table [Text Block] Schedule of Components of Net Carrying Amount of Convertible Notes [Table Text Block] Inventory Disclosure [Abstract] Summary Of Inventories Schedule of Inventory, Current [Table Text Block] Disclosure Debt Additional Information [Abstract] Disclosure Debt Additional Information [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Debt Instrument Quarterly Installments Beginning June 30, 2014 through June 30, 2016 [Member] Debt Instrument Quarterly Installments Beginning June 30, 2014 through June 30, 2016 [Member] Debt Instrument Quarterly Installments Payable Through June 30, 2015 [Member] Debt Instrument Quarterly Installments Beginning June 30, 2016 through September 30, 2018 [Member] Debt Instrument Quarterly Installments Beginning June 30, 2016 through September 30, 2018 [Member] Debt Instrument Quarterly Installments Beginning June 30, 2016 through September 30, 2018 [Member] Debt Instrument Final Installments Payable on September 30, 2018 [Member] Debt Instrument Final Installments Payable on September 30, 2018 [Member] Debt Instrument Final Installments Payable on September 30, 2018 [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Base Rate Higher of Bank of America Prime Rate or Federal Funds Effective Rate [Member] Higher of Bank of America Prime Rate or Federal Funds Effective Rate [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Secured Revolving Credit Facility Senior Secured Revolving Credit Facility [Member] Senior Secured Revolving Credit Facility [Member] Incremental Commitment Agreement Incremental Commitment Agreement [Member] Incremental Commitment Agreement [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit Line of Credit [Member] Secured Debt Secured Debt [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Revolving Commitments and/or Term Loans Revolving Commitments and/or Term Loans [Member] Revolving Commitments and/or Term Loans [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Servicing Liabilities at Fair Value by Class [Axis] Servicing Liabilities at Fair Value by Class [Axis] Types of Financial Instruments [Domain] Financial Instruments [Domain] Senior Unsecured Five Point Zero Percentage Convertible Notes Due Two Thousand And Twenty Eight [Member] Senior Unsecured Five Point Zero Percentage Convertible Notes Due Two Thousand And Twenty Eight [Member] Senior Unsecured Five Point Zero Percentage Convertible Notes Due Two Thousand And Twenty Eight [Member] Three point three seven five convertible notes [Member] Three point three seven five convertible notes [Member] Three point three seven five convertible notes [Member] Convertible Notes Payable Convertible Notes Payable [Member] 2011 Credit Facility due 2018 Two Thousand And Eleven Credit Facility [Member] Two Thousand and Eleven Credit Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Face value of debt instrument Debt Instrument, Face Amount Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Debt Instrument, Periodic Payment Debt Instrument, Periodic Payment Line of Credit Facility, Incremental Term Loan Commitment Line of Credit Facility, Incremental Term Loan Commitment Line of Credit Facility, Incremental Term Loan Commitment Debt Instrument, Convertible, Percent of Holders that Exercised Conversion Rights Debt Instrument, Convertible, Percent of Holders that Exercised Conversion Rights Debt Instrument, Convertible, Percent of Holders that Exercised Conversion Rights Payment of principal and accreted interest on Convertible Notes Repayments of Convertible Debt Number of shares issued from conversion Debt Conversion, Converted Instrument, Shares Issued Line of Credit Facility, Incremental Revolving Commitment Line of Credit Facility, Incremental Revolving Commitment Line of Credit Facility, Incremental Revolving Commitment Short-term debt Short-term Debt Short-term Debt, Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate Available lines of credit Line of Credit Facility, Remaining Borrowing Capacity Outstanding amount Long-term Line of Credit Line of Credit Facility, Increase in Borrowing Capacity Limit Line of Credit Facility, Increase in Borrowing Capacity Limit Line of Credit Facility, Increase in Borrowing Capacity Limit Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Company Owned Capital Stock Percentage Securing Senior Secured Credit Facility Company Owned Capital Stock Percentage Securing Senior Secured Credit Facility Company owned capital stock percentage securing senior secured credit facility Stand by letters of credit Letters of Credit Outstanding, Amount Long-term debt Long-term Debt Debt Instrument Interest Rate Debt Instrument, Interest Rate, Stated Percentage Long-term Debt, Gross Long-term Debt, Gross Convertible Notes, Fair Value Convertible Debt, Fair Value Disclosures Temporary Equity, Carrying Amount, Attributable to Parent Temporary Equity, Carrying Amount, Attributable to Parent Payments of Financing Costs Payments of Financing Costs Amortization of Other Deferred Charges Amortization of Other Deferred Charges Deferred Finance Costs, Net Deferred Finance Costs, Net Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Compensation and Retirement Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] United States Pension Plans of US Entity, Defined Benefit United States Pension Plan of US Entity [Member] Foreign Pension Plans, Defined Benefit Foreign Pension Plan [Member] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization and deferral Defined Benefit Plan, Amortization of Gains (Losses) Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net of allowance for doubtful accounts: June 28, 2015 - $8,005; March 31, 2015 - $7,562 Accounts Receivable, Net, Current Total Inventory, Net Deferred taxes Deferred Tax Assets, Net of Valuation Allowance, Current Prepaid and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant, and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total assets Assets Liabilities and Equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Total current liabilities Liabilities, Current Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Deferred taxes Deferred Tax Liabilities, Net, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Redeemable noncontrolling interests Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Redeemable equity component of Convertible Notes Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at June 28, 2015 and at March 31, 2015 Preferred Stock, Value, Issued Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 54,093,992 shares issued and 44,488,045 shares outstanding at June 28, 2015; 53,664,639 shares issued and 44,068,588 shares outstanding at March 31, 2015 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock, at cost, 9,605,947 shares held as of June 28, 2015; 9,596,051 shares held as of March 31, 2015 Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total EnerSys stockholders' equity Stockholders' Equity Attributable to Parent Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Net Periodic Benefit Cost Related To Defined Benefit Pension Plans Schedule of Defined Benefit Plans Disclosures [Table Text Block] Income Statement [Abstract] Net sales Revenue, Net Cost of goods sold Cost of Goods Sold Gross profit Gross Profit Operating expenses Operating Expenses Restructuring charges Restructuring Charges Litigation Settlement, Amount Litigation Settlement, Amount Gain on sale of facility Gain (Loss) on Disposition of Property Plant Equipment Operating earnings Operating Income (Loss) Interest expense Interest Expense Other (income) expense, net Other Nonoperating Income (Expense) Earnings before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net losses attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net earnings attributable to EnerSys stockholders Net Income (Loss) Attributable to Parent Net earnings per common share attributable to EnerSys stockholders: Earnings Per Share [Abstract] Basic earnings per common share attributable to EnerSys stockholders Earnings Per Share, Basic Diluted earnings per common share attributable to EnerSys stockholders Earnings Per Share, Diluted Dividends per common share Common Stock, Dividends, Per Share, Cash Paid Weighted average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Income Expense Other Income Expense [Member] Other income expense [member] Cost of Sales Cost of Sales [Member] Financial Instrument [Axis] Financial Instrument [Axis] Foreign currency forward contracts Foreign Exchange Forward [Member] Lead hedge forward contracts Forward Contracts [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Prepaid and other current assets Prepaid And Other Current Assets [Member] Prepaid and Other Current Assets [Member] Accrued expenses Accrued Liabilities [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivatives assets, Fair Value Derivative Asset, Fair Value, Gross Asset Derivatives liabilities, Fair Value Derivative Liability, Fair Value, Gross Liability Change In Number Of Shares Of Common Stock Outstanding Schedule of Stockholders Equity [Table Text Block] Components Of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Equity Attributable To Parent And Noncontrolling Interests [Table Text Block] Equity Attributable To Parent And Noncontrolling Interests [Table Text Block] Equity Attributable To Parent And Noncontrolling Interests [Table Text Block] Net earnings attributable to EnerSys stockholders Common shares from exercise and lapse of equity awards, net of shares assumed reacquired Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Conversion of Debt Securities Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Diluted weighted-average number of common shares outstanding Anti-dilutive equity awards not included in diluted weighted-average common shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Commitments, Contingencies and Litigation Commitments and Contingencies Disclosure [Text Block] Noncontrolling Interest [Abstract] Beginning balance, redeemable noncontrolling interests Net losses attributable to noncontrolling interests Temporary Equity, Net Income Foreign Currency Translation Adjustments Temporary Equity, Foreign Currency Translation Adjustments Ending balance, redeemable noncontrolling interests Debt Disclosure [Abstract] Principal Unamortized discount Debt Instrument, Unamortized Discount Long-term debt Disclosure Fair Value Of Financial Instruments Additional Information [Abstract] Disclosure Fair Value Of Financial Instruments Additional Information [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Employee Severance [Member] Employee Severance [Member] Other Restructuring [Member] Other Restructuring [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring reserve Restructuring Reserve Restructuring and Related Cost, Incurred Cost Restructuring and Related Cost, Incurred Cost Restructuring Reserve, Translation and Other Adjustment Restructuring Reserve, Translation and Other Adjustment Payments for Restructuring Payments for Restructuring Restructuring Reserve, Translation Adjustment Restructuring Reserve, Translation Adjustment Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Accelerated Share Repurchases, Date [Axis] Accelerated Share Repurchases, Date [Axis] Accelerated Share Repurchases, Date [Domain] Accelerated Share Repurchases, Date [Domain] January 2016 [Member] January 2016 [Member] January 2016 [Member] January 1, 2016 to January 19, 2017 [Member] January 1, 2016 to January 19, 2017 [Member] January 1, 2016 to January 19, 2017 [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Accelerated Share Repurchase Agreement [Member] Accelerated Share Repurchase Agreement [Member] Accelerated Share Repurchase Agreement [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Debt Conversion, Converted Instrument, Shares Issued Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Repurchased During Period, Value Stock Repurchased During Period, Value Accelerated Share Repurchase Program, Adjustment Accelerated Share Repurchase Program, Adjustment Accelerated Share Repurchases, Adjustment to Recorded Amount Accelerated Share Repurchases, Adjustment to Recorded Amount Accelerated Share Repurchase Program Other Current Assets Accelerated Share Repurchase Program Other Current Assets Accelerated Share Repurchase Program Other Current Assets Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Accelerated Share Repurchases, Settlement (Payment) or Receipt Accelerated Share Repurchases, Settlement (Payment) or Receipt Accelerated Share Repurchases, Final Price Paid Per Share Accelerated Share Repurchases, Final Price Paid Per Share Number of shares of common stock purchased Treasury Stock, Shares, Acquired Treasury stock, shares Treasury Stock, Shares Disclosure Earnings Per Share Additional Information [Abstract] Disclosure Earnings Per Share Additional Information [Abstract] Treasury Stock, Shares, Acquired Fair Value of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] The Effect Of Derivative Instruments On Consolidated Condensed Statements Of Income Schedule Of Derivative Instruments Effect On Other Comprehensive Income Loss And Cash Flow Hedges Included In Accumulated Other Comprehensive Income Loss Reclassified To Earnings [Table Text Block] Schedule of Derivative Instruments Effect on Other Comprehensive Income Loss and Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Reclassified to Earnings [Table Text Block] Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Statement of Cash Flows [Abstract] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Manufacturing Facility Manufacturing Facility [Member] Property, Plant, and Equipment Excluding Manufacturing Facility [Member] Property, Plant, and Equipment Excluding Manufacturing Facility [Member] Property, Plant, and Equipment Excluding Manufacturing Facility [Member] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Restructuring Costs Restructuring Costs Derivatives not designated in hedging relationships: Derivative, Gain (Loss) on Derivative, Net [Abstract] Net (gains) losses Gain (Loss) on Derivative Instruments, Net, Pretax Cash settlements Cash Settlements Derivatives Operating Activities Cash settlements derivatives operating activities. Provision for doubtful accounts Provision And Recovery For Doubtful Accounts Provision and Recovery For Doubtful Accounts Deferred income taxes Deferred Income Tax Expense (Benefit) Non-cash interest expense Noncash Interest Expense Accretion And Amortization Of Deferred Finance Fees Noncash interest expense accretion and amortization of deferred finance fees. Stock-based compensation Share-based Compensation Gain on disposal of property, plant, and equipment Gain (Loss) Related to Litigation Settlement Gain (Loss) Related to Litigation Settlement Gain (Loss) on Sale of Assets and Asset Impairment Charges Gain (Loss) on Sale of Assets and Asset Impairment Charges Changes in assets and liabilities, net of effects of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventory Increase (Decrease) in Inventories Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Purchase of a business Payments to Acquire Businesses, Net of Cash Acquired Proceeds from disposal of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Payments for (Proceeds from) Other Investing Activities Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase in short-term debt Proceeds from (Repayments of) Short-term Debt Proceeds from revolving credit borrowings Proceeds from Lines of Credit Repayments of revolving credit borrowings Repayments of Lines of Credit Proceeds from long-term debt Proceeds from Issuance of Other Long-term Debt Repurchase of Convertible Notes Repayments of Long-term Debt Repayments of Long-term Debt Deferred financing costs Taxes paid related to net share settlement of equity awards, net of option proceeds Proceeds From Stock Plans And Payments Related To Tax Withholding For Share Based Compensation Proceeds From Stock Plans And Payments Related To Tax Withholding for Share Based Compensation Excess tax benefits from exercise of stock options and vesting of equity awards Excess Tax Benefit from Share-based Compensation, Financing Activities Purchase of treasury stock Payments for Repurchase of Common Stock Prepayments for Accelerated Share Repurchase Prepayments for Accelerated Share Repurchase Prepayments for Accelerated Share Repurchase Dividends paid to stockholders Payments of Dividends Other Proceeds From Repayments Of Capital Lease Obligations And Other Proceeds From (Repayments Of) Capital Lease Obligations And Other Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Debt Debt Disclosure [Text Block] Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, par value Common Stock, Par or Stated Value Per Share Common Stock, shares authorized Common Stock, Shares Authorized Common Stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Disclosure Restructuring Plans Additional Information [Abstract] Disclosure - Restructuring Plans - Additional Information [Abstract] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Americas Americas [Member] European Operations European Operations [Member] European Operations [Member] Asia Asia [Member] Restructuring Action [Axis] Restructuring Action [Axis] Restructuring Action [Axis] Restructuring Action [Domain] Restructuring Action [Domain] Restructuring Action [Domain] Restructuring Related To A Portion Of Sales And Engineering in Europe [Member] Restructuring Related To A Portion Of Sales And Engineering in Europe [Member] Restructuring Related To A Portion Of Sales And Engineering in Europe [Member] Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] Restructurings Related To Improving Efficiency Related to Motive POwer Assembly and Distribution Center [Member] Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member] Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member] Restructurings Related To Improving Efficiency of Manufacturing Operations in EMEA [Member] Restructurings Related To Manufacturing Facility in Jiangdu [Member] Restructurings Related To Manufacturing Facility in Jiangdu [Member] Restructurings Related To Manufacturing Facility in Jiangdu [Member] Restructurings Related To Improving Efficiency Of Manufacturing Operations In Americas [Member] Restructurings Related To Improving Efficiency Of Manufacturing Operations In Americas [Member] Restructurings Related To Improving Efficiency Of Manufacturing Operations In Americas [Member] Non Cash Charges [Member] Non Cash Charges [Member] Non Cash Charges [Member] Cash Charges [Member] Cash Charges [Member] Cash Charges [Member] Expected reduction in number of employees Restructuring and Related Cost, Expected Number of Positions Eliminated Charges related to restructuring plan Restructuring charges, non-cash charges related to the write-off of fixed assets and inventory Restructuring Reserve, Settled without Cash Restructuring charges, cash charges related to employee severance and other charges Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Expected additional restructuring charges Restructuring and Related Cost, Expected Cost Severance Costs Severance Costs Noncontrolling Interest [Table] Noncontrolling Interest [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Redeemable Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] Nonredeemable Noncontrolling Interest [Member] Nonredeemable Noncontrolling Interest [Member] Nonredeemable Noncontrolling Interest [Member] Stockholders' Equity, Total [Member] Stockholders' Equity, Total [Member] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Dividends declared (in dollars per share) Stockholders' Equity Attributable to Noncontrolling Interest Net earnings attributable to noncontrolling interests Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Amount reclassified out of AOCI, net of tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Foreign currency translation adjustment, Net-of Tax Amount Other Comprehensive Income Foreign Currency Translation Adjustment Net Of Tax Period Increase Decrease Other Comprehensive Income Foreign Currency Translation Adjustment Net Of Tax Period Increase Decrease Total other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Payments for Repurchase of Common Stock Stock Issued During Period, Value, Treasury Stock Reissued Stock Issued During Period, Value, Treasury Stock Reissued Payments of Dividends Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Proceeds from Stock Options Exercised Proceeds from Stock Options Exercised Statement of Comprehensive Income [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized gain (loss) on derivative instruments, net of tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Pension funded status adjustment, net of tax Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to EnerSys stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Deferred Bonus and Profit Sharing Plan by Title of Individual [Axis] Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Relationship to Entity [Domain] Management Management [Member] Non-employee Directors [Member] Non-employee Directors [Member] Non-employee Directors [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Performance Shares Performance Shares [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Nonqualified Stock Options Nonqualified Stock Options [Member] Non-Qualified Stock Options [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares available for future grants Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Equity-based compensation expense Allocated Share-based Compensation Expense Stock options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Stock unit grants during period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Percentage of restricted stock units granted, vested per year Percentage Of Restricted Stock Units Granted Vested Per Year Percentage of restricted stock units granted, vested per year. Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vested restricted stock and restricted stock units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock option grants outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Net unrealized (gain) on derivative instruments Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Unrealized gain (loss) on derivative instruments, Tax Benefit (Expense) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount Pension funded status adjustment, Before-Tax Amount Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax Pension funded status adjustment, Tax Benefit (Expense) Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Net periodic benefit cost, net of tax Restructuring Plans Restructuring and Related Activities Disclosure [Text Block] Disclosure Analysis Of Changes In Liability For Product Warranties [Abstract] Disclosure - Analysis of Changes in Liability for Product Warranties [Abstract] Balance at beginning of period Product Warranty Accrual Current period provisions Product Warranty Accrual, Warranties Issued Costs incurred Product Warranty Accrual, Payments Foreign exchange and other Product Warranty Accrual, Currency Translation, Increase (Decrease) Balance at end of period Fair Value Disclosures [Abstract] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount [Member] Reported Value Measurement [Member] Fair Value [Member] Estimate of Fair Value Measurement [Member] Derivative asset Derivative Asset Notes Notes Payable, Fair Value Disclosure Convertible Notes Derivative liability Derivative Liability Shares outstanding, beginning balance Number of shares of common stock purchased Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Shares outstanding, ending balance Income Taxes Income Tax Disclosure [Text Block] Disclosure Income Taxes Additional Information [Abstract] Disclosure Income Taxes Additional Information [Abstract] Effective income tax rates Effective Income Tax Rate Reconciliation, Percent Deferred Income Tax Expense (Benefit) Income (Loss) from Continuing Operations before Income Taxes, Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Tax Rate of Swiss Subsidiary Tax Rate of Swiss Subsidiary Tax Rate of Swiss Subsidiary Reconciliation of Restructuring Reserve Restructuring and Related Costs [Table Text Block] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Warranties Product Warranty Disclosure [Text Block] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative fair value Derivative, Fair Value, Net Disclosure Commitments Contingencies And Litigation Additional Information [Abstract] Disclosure - Commitments Contingencies and Litigation - Additional Information [Abstract] Commitments, Contingencies And Litigation [Table] Commitments Contingencies And Litigation [Table] Commitments, Contingencies And Litigation [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Europe Europe [Member] Commitments, Contingencies And Litigation [Line Items] Commitments Contingencies And Litigation [Line Items] Commitments, Contingencies And Litigation [Line Items] Litigation Settlement, Amount Provision For Environmental Liabilities Provision For Environmental Liabilities Provision for environmental liabilities Purchase price of hedges, pounds of lead Fair Value Hedges At Fair Value Net Units Fair Value Hedges At Fair Value Net, Units Purchase price of hedges Fair Value Hedges, Net Raw materials Inventory, Raw Materials, Net of Reserves Work-in-process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Weighted Average Number of Shares Schedule of Weighted Average Number of Shares [Table Text Block] Financial Assets And (Liabilities), Measured At Fair Value On A Recurring Basis Fair Value, Measurement Inputs, Disclosure [Text Block] Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Inventories Inventory Disclosure [Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Earnings Per Share Earnings Per Share [Text Block] Debt and Capital Lease Obligations Debt and Capital Lease Obligations Unamortized Debt Issuance Expense Unamortized Debt Issuance Expense Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Entities [Table] Entities [Table] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Disclosure Derivative Financial Instruments Additional Information [Abstract] Disclosure Derivative Financial Instruments Additional Information [Abstract] Notional amount in pounds Investment Contract Weight Hedging Derivatives Maturity Upper Limit Hedging Derivatives Maturity Upper Limit Hedging Derivatives, Maturity, Upper Limit Notional amount Derivative, Notional Amount Recorded expense in the consolidated condensed statements of income Components of Accumulated Other Comprehensive Income [Roll Forward] Components of Accumulated Other Comprehensive Income [Roll Forward] Components of Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Pension funded status adjustment Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Unrealized gain on derivative instruments Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Foreign currency translation adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated other comprehensive income Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract] Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract] Amount recognized in AOCI, net of tax Amount recognized in AOCI, net of tax Amount recognized in AOCI, net of tax Amount recognized in AOCI - Derivatives, net of tax Amount recognized in AOCI - Derivatives, net of tax Amount recognized in AOCI - Derivatives, net of tax Amount recognized in AOCI - CTA, net of tax Amount recognized in AOCI - CTA, net of tax Amount recognized in AOCI - CTA, net of tax Accumulated other comprehensive income, Before-Tax Amount Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax [Abstract] Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax [Abstract] Amount reclassified out of AOCI - Derivatives, net of tax Amount reclassified out of AOCI - CTA, net of tax Amount reclassified out of AOCI - CTA, net of tax Amount reclassified out of AOCI - CTA, net of tax Accumulated other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Pension funded status adjustment Unrealized gain on derivative instruments Foreign currency translation adjustment Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Reserve Power Reserve Power [Member] Reserve Power [Member] Motive Power Motive Power [Member] Motive Power [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of Reportable Segments Number of Reportable Segments Total net sales Net sales revenue by services Sales Revenue, Services, Net Total intersegment sales Revenues Total operating earnings Gain (Loss) Related to Litigation Settlement Litigation Settlement, Amount Subsequent Events Subsequent Events [Text Block] Segment Reporting [Abstract] Selected Financial Data for Reportable Business Segments and Product Lines Schedule of Segment Reporting Information, by Segment [Table Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Analysis Of Changes In Liability For Product Warranties Schedule of Product Warranty Liability [Table Text Block]