Share-Based Compensation - Additional Information (Detail) - Restricted Stock [Member] - USD ($) |
12 Months Ended | ||
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Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
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| Disclosure Of Compensation Related Costs Share Based Payments [Line Items] | |||
| Number of shares issued | 0 | ||
| Shares Vested period | 4 years | ||
| Share based comepnsation arrangement,award vesting conditions | The Company’s board of directors issued ordinary A shares of Mirion TopCo common stock for the fair value at the time of issuance. In total, the Company has issued 1,483,795 shares as of June 30, 2021. The shares were issued subject to certain vesting conditions, restrictions on transfer and repurchase rights (further collectively referred to as “Shares”) by Mirion TopCo, other employees of the Company or by investors in Mirion TopCo. Under the service vesting conditions, the Shares, vest over four years, with one-quarter vesting after one year of service, and the remainder vesting in equal installments over the subsequent thirty-six months. | ||
| Share based compensation arrangement,Requisite Service Period | 4 years | ||
| Number of shares existed or granted during period | 0 | 200,000 | 0 |
| Number of shares reissued to members of management team | 144,219 | ||
| Share based compensation expense | $ 0.0 | $ 200,000 | $ 100,000 |
| Unrecognised compensation expense | $ 0 | ||
| Ordinary A shares of Mirion TopCo common stock [Member] | |||
| Disclosure Of Compensation Related Costs Share Based Payments [Line Items] | |||
| Number of shares issued | 1,483,795 | ||
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- Definition Disclosure of compensation related costs sharebased payments. No definition available.
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- Definition Share based compensation arrangement by share based payment award,number of shares reissued. No definition available.
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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