| Document and Entity Information | Oct. 19, 2021 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K/A |
| Document Period End Date | Oct. 19, 2021 |
| Entity Registrant Name | Mirion Technologies, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39352 |
| Entity Tax Identification Number | 83-0974996 |
| Entity Address, Address Line One | 1218 Menlo Drive |
| Entity Address, City or Town | Atlanta |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30318 |
| City Area Code | 770 |
| Local Phone Number | 432-2744 |
| Entity Information, Former Legal or Registered Name | GS Acquisition Holdings Corp II |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Description | On October 25, 2021, Mirion Technologies, Inc., a Delaware corporation (the “Company”), filed a Current Report on Form 8-K (the “Original Report”) to report the Closing and related matters under Items 1.01, 2.01, 3.02, 4.01, 5.01, 5.02, 5.07, 8.01 and 9.01 of Form 8-K. Due to the large number of events to be reported under the specified items of Form 8-K, this Amendment No. 1 to the Original Report (this “Amendment No. 1”) is being filed to amend the Original Report to include additional matters related to the Transactions under Items 3.03, 5.03, 5.05 and 5.06 of Form 8-K.Capitalized terms used herein but not defined herein have the meanings given to such terms in the Original Report. |
| Current Fiscal Year End Date | --12-31 |
| Amendment Flag | true |
| Entity Central Index Key | 0001809987 |
| Former Address [Member] | |
| Document And Entity Information [Line Items] | |
| Entity Address, Address Line One | 200 West Street |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10282 |
| Class A common stock, $0.0001 par value per share [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, $0.0001 par value per share |
| Trading Symbol | MIR |
| Security Exchange Name | NYSE |
| Redeemable warrants to purchase Class A common stock [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants to purchase Class A common stock |
| Trading Symbol | MIRW |
| Security Exchange Name | NYSE |
