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Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Over time (including professional service and other revenue) Transferred over Time [Member] July 1, 2025 - June 30, 2026 Recorded Unconditional Purchase Obligation, to be Paid, Year One Curtailment (gain) loss Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] AMC Business AMC AMC Business [Member] AMC Business Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other Deferred Tax Liabilities, Other Retirement Plan Type [Axis] Retirement Plan Type [Axis] Other miscellaneous income (expense) Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Deferred taxes Total deferred income taxes (recoveries) Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Decreases due to lapses of statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Quarterly repayment as percentage of principal Debt Instrument, Periodic Payment, Quarterly Repayment Percentage of Principal Debt Instrument, Periodic Payment, Quarterly Repayment Percentage of Principal Net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Unrealized gain (loss) on available-for-sale financial assets: Unrealized Gain (Loss) on Available-for-Sale Financial Assets [Abstract] Unrealized Gain (Loss) on Available-for-Sale Financial Assets Beginning balance (in shares) Ending balance (in shares) Shares, Issued Interest expense carryforwards Deferred Tax Assets, Other Loss Carryforwards Other Defined Benefit Plan, Other Assets [Member] Defined Benefit Plan, Other Assets Finance lease liabilities (non-current) Finance Lease, Liability, Noncurrent ROU assets acquired Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Operating Lease, Right-of-Use Asset Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Operating Lease, Right-of-Use Asset BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Schedule of Acquired Intangibles by Asset Class Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Number of defined benefit and other postretirement plans Number Of Defined Benefit And Other Postretirement Plans Number Of Defined Benefit And Other Postretirement Plans Treasury stock, at cost (4,648,036 and 3,135,980 shares at June 30, 2025 and June 30, 2024, respectively) Treasury Stock, Common, Value Acquired receivables, gross contractual amount Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Gross Contractual Amount Termination Date Trading Arrangement Termination Date Proceeds from interest on derivative instruments Proceeds from Hedge, Investing Activities Contract assets Increase (Decrease) in Contract with Customer, Asset Average exercised share price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Average Exercise Price Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Long term debt obligations Maturities of Long-Term Debt and Capital Lease Obligations [Abstract] July 1, 2028 - June 30, 2030 Recorded Unconditional Purchase Obligation, to be Paid, Year Four and Five Recorded Unconditional Purchase Obligation, to be Paid, Year Four and Five Senior Notes 2029 Senior Notes 2029 [Member] Senior Notes 2029 Operating leases Operating Lease, Weighted Average Discount Rate, Percent Schedule of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Revenues Business Combination, Acquiree's Revenue since Acquisition Date, Actual Weighted average number of Common Shares outstanding—basic (in shares) Basic (in shares) Weighted Average Number of Shares Outstanding, Basic SUPPLEMENTAL CASH FLOW DISCLOSURES Cash Flow, Supplemental Disclosures [Text Block] Land and buildings Land and Building [Member] Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Unrealized gain (loss) on cash flow hedge Unrealized Gain (Loss) On Cash Flow Hedge [Member] Unrealized Gain (Loss) On Cash Flow Hedge Exercisable ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Impairment loss Capitalized Contract Cost, Impairment Loss Debt Disclosure [Abstract] Debt Disclosure [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Write-off/adjustments Accounts Receivable, Allowance for Credit Loss, Writeoff Interest expense (income) Unrecognized Tax Benefits, Interest on Income Taxes Expense Asset impairment Contract with Customer, Asset, Credit Loss Expense (Reversal) All other countries All Other Countries [Member] All other countries [Member] Restructuring costs and other reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Revision of Prior Period, Reclassification, Adjustment Revision of Prior Period, Reclassification, Adjustment [Member] Income taxes recoverable (Note 15) Income Taxes Receivable, Current 2030 to 2034 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Accounts receivable trade, net of allowance for credit losses Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Performance options granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Use of estimates Use of Estimates, Policy [Policy Text Block] Current portion of benefit obligation Liability, Defined Benefit Plan, Current Payments of dividends to shareholders Payments of dividends Payments of Dividends Difference in tax filing positions from provision (4) Effective Income Tax Rate Reconciliation, Difference In Tax Filing Positions, Amount Effective Income Tax Rate Reconciliation, Difference In Tax Filing Positions, Amount Impact of foreign exchange rate changes Capitalized Contract Cost, Foreign Exchange Adjustments Capitalized Contract Cost, Foreign Exchange Adjustments Less: Current portion Liability, Defined Benefit Pension Plan, Current Right Of Use Assets Obtained In Exchange For New Lease Liabilities [Abstract] Right Of Use Assets Obtained In Exchange For New Lease Liabilities [Abstract] Right Of Use Assets Obtained In Exchange For New Lease Liabilities SUBSEQUENT EVENTS Subsequent Events [Text Block] Net foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Units Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Expiration period of options, maximum term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Expire Period, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Award Expire Period, Maximum Sublease income to be received thereafter Lessor, Operating Lease, Payment to be Received, Thereafter Lessor, Operating Lease, Payment to be Received, Thereafter Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Other Income (Expense) Other Nonoperating Income (Expense) [Member] 2030 Finance Lease, Liability, to be Paid, Year Five Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Increases on account of current year positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Operating loss carryforwards, no expiration Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration Purchase obligations for contracts not accounted for as lease obligations Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract] Defined benefit plan, expected future employer contributions, next fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Average trading volume (in shares) Average Daily Trading Volume, Shares Average Daily Trading Volume, Shares Value of shares issued Stock Issued During Period, Value, New Issues Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Accounts Payable and Accrued Liabilities