Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.22.1
Cover - shares
 9 Months Ended
Sep. 25, 2021
Nov. 05, 2021
Document Information [Line Items]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Sep. 25, 2021  
Document Transition Report false  
Entity File Number 001-40456  
Entity Registrant Name JANUS INTERNATIONAL GROUP, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 86-1476200  
Entity Address, Address Line One 135 Janus International Blvd.  
Entity Address, City or Town Temple  
Entity Address, State or Province GA  
Entity Address, Postal Zip Code 30179  
City Area Code 866  
Local Phone Number 562-2580  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   142,936,580
Current Fiscal Year End Date --01-01  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Amendment Flag true  
Entity Central Index Key 0001839839  
Amendment Description The amended 10-Q reflects the reclassification and presentation of certain transaction bonuses related to the Business Combination from a component of stockholders’ equity to a component of general and administrative expense for the nine months period ended September 25, 2021 upon the closing of the Business Combination in June 2021 and the reclassification of the private placement warrants from liability-classified instruments to equity-classified instruments including the remeasurement of the private placement warrants to fair value at the date of reclassification for the three and nine months period ended September 25, 2021. In addition, the Company determined that certain other transaction bonuses related to the Business Combination should have been recorded in the Janus International segment instead of the Janus North American segment. The errors related to the transaction bonuses impacted the presentation of our segment reporting for the same periods.  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol JBI  
Security Exchange Name NYSE  
Warrant    
Document Information [Line Items]    
Title of 12(b) Security Warrants, each to purchase one share of Common Stock  
Trading Symbol JBI WS  
Security Exchange Name NYSE