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During Period, Shares, Conversion of Convertible Securities Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic (in dollars per share) Net earnings per common share attributable to Mirion Technologies, Inc. — basic (in dollars per share) Earnings Per Share, Basic Total current assets Assets, Current Insider Trading Arrangements [Line Items] Debt, non-current Long-Term Debt, Excluding Current Maturities Accounts receivable, net of allowance for doubtful accounts Accounts Receivable, after Allowance for Credit Loss, Current Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Brian Schopfer [Member] Brian Schopfer Compensation Actually Paid vs. Company Selected 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[Table] Accounts payable Accounts Payable, Current Other Other Noncash Income (Expense) Convertible Senior Notes Due 2031 (Notes) 2031 notes Convertible Senior Notes Due 2031 (Notes) [Member] Convertible Senior Notes Due 2031 (Notes) Thereafter Lessee, Operating Lease, Liability, To Be Paid, Thereafter Lessee, Operating Lease, Liability, To Be Paid, Thereafter Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Accrued expenses and other current liabilities Business Combination, Recognized Liability Assumed, Accrued Liabilities And Other Liabilities, Current Business Combination, Recognized Liability Assumed, Accrued Liabilities And Other Liabilities, Current Purchase consideration Business Combination, Consideration Transferred Entity Filer Category Entity Filer Category 2021 Omnibus Incentive Plan 2021 Omnibus Incentive Plan [Member] 2021 Omnibus Incentive Plan Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Net tangible assets acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Tangible Assets Acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Tangible Assets Acquired Measurement period Adjustments, Cash Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash Year ending December 31: Long-Term Debt, Fiscal Year Maturity [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Net income Net income Net income (loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Common stock issuance costs in accrued expenses and other liabilities Common Stock Issuance Costs in Accrued Expenses and Other Liabilities Common Stock Issuance Costs in Accrued Expenses and Other Liabilities Current assets: Assets, Current [Abstract] 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Acquisitions Pro Forma Revenue Profit Loss Business acquisitions pro forma revenue profit loss. 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