General form of registration statement for all companies including face-amount certificate companies

Parent Company Financial Information - Additional Information (Detail)

v3.21.2
Parent Company Financial Information - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
MIRION TECHNOLOGIES LTD [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash $ 0 $ 0 $ 0