Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of the Registrant - Narrative (Details)

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Schedule I - Condensed Financial Information of the Registrant - Narrative (Details) - USD ($)
4 Months Ended 12 Months Ended
Oct. 20, 2021
Oct. 19, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2021
Jul. 01, 2021
Jul. 01, 2020
Jul. 01, 2019
Jul. 01, 2018
Total cash, cash equivalents, and restricted cash shown in the statements of cash flow   $ 103,100,000 $ 102,400,000 $ 120,000,000.0 $ 37,600,000 $ 85,300,000 $ 102,400,000 $ 120,000,000.0 $ 37,600,000 $ 35,900,000
SPAC share redemption $ (146,300,000) 0 0 0 0          
MIRION TECHNOLOGIES LTD                    
Cash   0 $ 0 $ 0 $ 0 $ 0        
Total cash, cash equivalents, and restricted cash shown in the statements of cash flow   $ 750,200,000                
SPAC share redemption $ 146,300,000