Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.21.2
Cover Page - shares
 9 Months Ended
Sep. 30, 2021
Oct. 20, 2021
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Amendment Flag false  
Document Period End Date Sep. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Registrant Name Mirion Technologies, Inc.  
Entity Central Index Key 0001809987  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Address, State or Province GA  
Entity Interactive Data Current Yes  
Entity File Number 001-39352  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 1218 Menlo Drive  
Entity Tax Identification Number 83-0974996  
Entity Address, City or Town Atlanta  
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  
Common Class A [Member]    
Document Information [Line Items]    
Title of 12(b) Security Class A common stock, par value $0.0001 per share  
Trading Symbol MIR  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   199,523,292
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,560,540
Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 [Member]    
Document Information [Line Items]    
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50  
Trading Symbol MIR WS  
Security Exchange Name NYSE  
Former Address [Member]    
Document Information [Line Items]    
Entity Address, State or Province NY  
Entity Address, Address Line One 200 West Street  
Entity Address, City or Town New York