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

Description of Organization and Business Operations - Additional Information (Detail)

v3.21.2
Description of Organization and Business Operations - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jul. 02, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Deposit to trust account   $ 750,000,000   $ 750,000,000      
Percentage of public shares required to repurchase if business combination is not completed within specified period     100.00%   100.00%    
Balance in trust account     $ 750,089,714   $ 750,067,041    
Accrued dividends     $ 3,758   $ 3,883   $ 0
Percentage of fair market value to that of balance in the trust account     80.00%   80.00%    
Interest to pay dissolution expenses     $ 100,000   $ 100,000    
Period from closing of public offering to complete business combination     24 months   24 months    
Cash     $ 799,624   $ 383,246   $ 5,000
Common Class A [Member]              
Organization And Business Operations [Line Items]              
Common stock, par value   $ 0.01 $ 0.01 $ 0.01      
Common Class A [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Shares issued during the period,shares     75,000,000   75,000,000    
Common stock, par value $ 0.0001   $ 0.0001   $ 0.0001 $ 0.0001 $ 0.0001
Common Class B [Member]              
Organization And Business Operations [Line Items]              
Common stock, par value   $ 0.01 0.01 $ 0.01      
Common Class B [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Common stock, par value     $ 0.0001   $ 0.0001   $ 0.0001
Mirion Technologies And The Charter Parties [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Business combination consideration transferred     $ 1,700,000,000        
Mirion Technologies And The Charter Parties [Member] | Pipe Investors [Member] | Common Class A [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Business acquisition equity interest issued or issuable, number of shares     90,000,000        
Business acquisition, equity interest issued or issuable value assigned     $ 900,000,000        
Mirion Technologies And The Charter Parties [Member] | Minimum Cash Condition [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Cash     50,000,000        
Mirion Technologies And The Charter Parties [Member] | Minimum Cash Condition [Member] | Common Class A [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Payments to acquire businesses gross     $ 1,310,000,000        
Mirion Technologies And The Charter Parties [Member] | Minimum Cash Condition [Member] | Common Class B [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Common stock, par value     $ 0.01        
Asset Held in Trust [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Accrued dividends     $ 3,758   $ 3,883    
IPO [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Shares issued during the period,shares 75,000,000            
IPO [Member] | Common Class A [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Common stock, par value     $ 0.0001   $ 0.0001    
Underwriter Option [Member] | IPO [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Shares issued during the period,shares 5,000,000            
Maximum [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Payment of deferred underwriting commissions     $ 5,000,001   $ 5,000,001    
Minimum [Member] | Mirion Technologies And The Charter Parties [Member] | Minimum Cash Condition [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Payments to acquire businesses gross     $ 1,310,000,000        
Minimum [Member] | Mirion Technologies And The Charter Parties [Member] | Minimum Cash Condition [Member] | Common Class A [Member] | GS Acquisition Holdings Corp II [Member]              
Organization And Business Operations [Line Items]              
Common stock, par value     $ 0.01