Acquisitions [Abstract] Acquisitions [Abstract] Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Text Block [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [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 Restructuring Plans Restructuring and Related Activities Disclosure [Text Block] 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] 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] Servicing Liabilities at Fair Value by Class [Axis] Servicing Liabilities at Fair Value by Class [Axis] Types of Financial Instruments [Domain] Financial Instruments [Domain] Convertible Notes Payable Convertible Notes Payable [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Face 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[Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Interest rate swap agreements Interest Rate Swap [Member] Foreign currency forward contracts Foreign Exchange Forward [Member] Lead hedge forward contracts Forward Contracts [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of Sales Cost of Sales [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Derivatives, Fair Value [Line 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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 Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] 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] Shares outstanding, ending 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 Long-Term Debt And Capital Lease 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Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Reconciliation of Restructuring Reserve Restructuring and Related Costs [Table Text Block] 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 Payments for Restructuring Payments for Restructuring Restructuring Reserve, Translation Adjustment Restructuring Reserve, Translation Adjustment Inventory Disclosure [Abstract] 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 Inventory, Net Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 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 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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 Loss (gain) on disposal of property, plant, and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 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 Proceeds from disposal of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment 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 Repayments of Convertible Debt Repayments of Convertible Debt Capital lease obligations Proceeds From Repayments Of Capital Lease Obligations And Other Proceeds From (Repayments Of) Capital Lease Obligations And Other Option proceeds (taxes paid related to net share settlement of equity awards), net 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 Payments of Dividends Payments of Dividends 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 Carrying Value Cash and cash equivalents at end of period Subsequent Events Subsequent Events [Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] 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] Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest Net earnings attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount 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 income (loss), 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 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 Net Periodic Benefit Cost Related To Defined Benefit Pension Plans Schedule of Defined Benefit Plans Disclosures [Table Text Block] 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] Award Type [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Nonqualified Stock Options Nonqualified Stock Options [Member] Non-Qualified Stock Options [Member] Market Stock Units Market Stock Units [Member] Market stock units [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 unit grants during period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 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 Stock option grants outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 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] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] 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 Long-term Debt Capital lease obligations and other Capital Lease Obligations Gross long-term debt and capital lease obligations Debt and Capital Lease Obligations Less current portion Long-term Debt and Capital Lease Obligations, Current Long-term debt and capital lease obligations Long-term Debt and Capital Lease Obligations Derivative Instruments and Hedging Activities Disclosure [Abstract] Other Income Expense Other Income Expense [Member] Other income expense [member] Dedesignated As Hedging Instrument Dedesignated As Hedging Instrument [Member] Dedesignated As Hedging Instrument [Member] Designated as Hedging Instrument 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] Other assets Other Assets [Member] Accrued expenses Accrued Liabilities [Member] Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Derivatives assets, Fair Value Derivative Asset, Fair Value, Gross Asset Derivatives liabilities, Fair Value Derivative Liability, Fair Value, Gross Liability 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 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 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Liability [Table Text Block] Disclosure Debt Additional Information [Abstract] Disclosure Debt Additional Information [Abstract] 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] 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] Amortized remaining discount period Debt Instrument, Convertible, Remaining Discount Amortization Period Aggregate consideration on conversion shares Debt Instrument Converted Instrument Number Of Shares On Delivery Of Aggregate Consideration Debt Instrument Converted Instrument Number Of Shares On Delivery Of Aggregate Consideration Interest rate percentage Debt Instrument, Interest Rate, Effective Percentage Amount of interest cost recognized for the amortization of the discount Interest Expense, Debt Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Incremental Term Loan Commitment Line of Credit Facility, Incremental Term Loan Commitment Line of Credit Facility, Incremental Term Loan Commitment 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 Stand by letters of credit Letters of Credit Outstanding, Amount Trading Days Trading Days Trading Days Percentage of conversion price Percentage of conversion price Percentage of conversion price Convertible Notes, Fair Value Convertible Debt, Fair Value Disclosures Temporary Equity, Carrying Amount, Attributable to Parent Temporary Equity, Carrying Amount, Attributable to Parent 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] Noncontrolling Interest Disclosure [Text Block] Noncontrolling Interest Disclosure [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] 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 Operating earnings Operating Income (Loss) Interest expense Interest Expense Other (income) expense, net 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 losses attributable to noncontrolling interests 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 Common Stock, Dividends, Per Share, Cash Paid 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 Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowance for doubtful accounts: June 29, 2014 - $9,474; March 31, 2014 - $9,446 Accounts Receivable, Net, Current Total 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] Current portion of long-term debt and capital lease obligations Debt, Current Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Total current liabilities Liabilities, Current Deferred taxes Deferred Tax Liabilities, Net, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Redeemable 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 29, 2014 and at March 31, 2014 Preferred Stock, Value, Issued Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 53,619,794 shares issued and 46,635,974 shares outstanding at June 29, 2014; 53,263,348 shares issued and 46,942,126 shares outstanding at March 31, 2014 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock, at cost, 6,983,820 shares held as of June 29, 2014; 6,321,222 shares held as of March 31, 2014 Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Total EnerSys stockholders' equity Stockholders' Equity Attributable to Parent Noncontrolling interests Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity 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] 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) 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 Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Goodwill Changes [Abstract] Goodwill Changes [Abstract] Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Warranties Product Warranty Disclosure [Text Block] Debt Debt Disclosure [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trademarks [Member] Trademarks [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Technology Equipment [Member] Technology Equipment [Member] Customer Relationships [Member] Customer Relationships [Member] Goodwill [Member] Goodwill [Member] Technology and Customer Relationships [Member] Technology and Customer Relationships [Member] Technology and Customer Relationships [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Indefinite-lived Intangible Assets Acquired Indefinite-lived Intangible Assets Acquired Acquired Finite-lived Intangible Asset, Amount Finite-lived Intangible Assets Acquired Goodwill, Acquired During Period Goodwill, Acquired During Period Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Fair Value Disclosures [Abstract] Derivatives assets, Carrying Amount Derivatives Asset Carrying Value Derivatives asset, Carrying value Convertible Notes Payable Convertible Notes Payable Derivatives liabilities Derivatives Liabilities Carrying Value Derivatives liabilities, Carrying value 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 Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] 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 Earnings Per Share Additional Information [Abstract] Disclosure Earnings Per Share Additional Information [Abstract] Number of common shares issue upon conversion Aggregate Consideration On Conversion Shares Aggregate consideration on conversion shares Average Price of Stock Average Price of Stock Average Price of Stock Disclosure Restructuring Plans Additional Information [Abstract] Disclosure - Restructuring Plans - Additional Information [Abstract] Restructuring Action [Axis] Restructuring Action [Axis] Restructuring Action [Axis] Restructuring Action [Domain] Restructuring Action [Domain] Restructuring Action [Domain] 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] Non Cash Charges [Member] Non Cash Charges [Member] Non Cash Charges [Member] Cash Charges [Member] Cash Charges [Member] Cash Charges [Member] European Operations European Operations [Member] European Operations [Member] Restructuring Plan [Axis] Restructuring Plan [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Restructuring Twenty Thirteen Actions Restructuring Twenty Thirteen Actions [Member] Restructuring Twenty Thirteen Actions [Member] Restructuring Twenty Fourteen Actions Restructuring Twenty Fourteen Actions [Member] Restructuring Twenty Fourteen Actions [Member] Restructuring Twenty Fifteen [Member] Restructuring Twenty Fifteen [Member] Restructuring Twenty Fifteen [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 Expected additional restructuring charges Restructuring and Related Cost, Expected Cost 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] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] EnerSys Delaware Inc and Altergy Systems Litigation [Member] EnerSys Delaware Inc and Altergy Systems Litigation [Member] EnerSys Delaware Inc and Altergy Systems Litigation [Member] EnerSys Delaware Inc. [Member] EnerSys Delaware Inc. [Member] EnerSys Delaware Inc. [Member] Commitments, Contingencies And Litigation [Line Items] Commitments Contingencies And Litigation [Line Items] Commitments, Contingencies And Litigation [Line Items] Derivative, Maturity Date Derivative, Maturity Date Derivative Type Of Convertible Interest Rate Swap Derivative Type Of Convertible Interest Rate Swap Derivative Type Of Interest Rate Swap Litigation Settlement, Amount Litigation Settlement, Amount Litigation Settlement, Interest Rate Litigation Settlement, Interest Rate Litigation Settlement, Interest Rate Gain (Loss) Related to Litigation Settlement, Net of Tax Gain (Loss) Related to Litigation Settlement, Net of Tax Gain (Loss) Related to Litigation Settlement, Net of Tax 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 Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Europe Europe [Member] Americas Americas [Member] Asia Asia [Member] 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] Total net sales Net sales revenue by services Sales Revenue, Services, Net Total intersegment sales Revenues Total operating earnings Commitments, Contingencies and Litigation Commitments and Contingencies Disclosure [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] Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Text Block] Summary Of Inventories Schedule of Inventory, Current [Table Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] EMEA EMEA [Member] Goodwill [Line Items] Goodwill [Line Items] Balance at beginning of year Adjustments related to the finalization of purchase accounting for Purcell Goodwill, Purchase Accounting Adjustments Foreign currency translation adjustment Goodwill, Translation Adjustments Balance at end of year