Mirion Technologies, Inc. Post-effective amendment to a registration statement that is not immediately effective upon filing

Income Taxes - Schedule of Open Tax Years by Major Jurisdictions (Details)	12 Months Ended
	Dec. 31, 2021
Foreign Jurisdiction \| Canada \| Earliest Tax Year
Years Open	2015
Foreign Jurisdiction \| Canada \| Latest Tax Year
Years Open	2021
Foreign Jurisdiction \| France \| Earliest Tax Year
Years Open	2019
Foreign Jurisdiction \| France \| Latest Tax Year
Years Open	2021
Foreign Jurisdiction \| Germany \| Earliest Tax Year
Years Open	2016
Foreign Jurisdiction \| Germany \| Latest Tax Year
Years Open	2021
Foreign Jurisdiction \| United Kingdom \| Earliest Tax Year
Years Open	2016
Foreign Jurisdiction \| United Kingdom \| Latest Tax Year
Years Open	2021
United States—Federal \| Internal Revenue Service (IRS) \| Earliest Tax Year
Years Open	2016
United States—Federal \| Internal Revenue Service (IRS) \| Latest Tax Year
Years Open	2021
United States—State \| Internal Revenue Service (IRS) \| Earliest Tax Year
Years Open	2004
United States—State \| Internal Revenue Service (IRS) \| Latest Tax Year
Years Open	2021