Annual report pursuant to Section 13 and 15(d)

Nature of Operations (Details)

v3.22.0.1
Nature of Operations (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2022
USD ($)
segment
Dec. 26, 2020
USD ($)
Aug. 31, 2021
Aug. 18, 2021
Aug. 17, 2021
Jan. 18, 2021
Jan. 02, 2020
Schedule of Equity Method Investments [Line Items]              
Number of reportable segments | segment 2            
Assets $ 1,122,002 $ 873,480          
Revenue 750,150 548,973          
Non-U.S.              
Schedule of Equity Method Investments [Line Items]              
Assets 58,439 53,424          
Revenue $ 68,579 $ 45,490          
G & M Stor-More Pty Ltd              
Schedule of Equity Method Investments [Line Items]              
Interest acquired           100.00%  
DBCI, LLC              
Schedule of Equity Method Investments [Line Items]              
Interest acquired       100.00% 100.00%    
Access Control Technologies, LLC              
Schedule of Equity Method Investments [Line Items]              
Interest acquired     100.00%        
Janus International Europe Holdings Ltd. (UK) | Janus International Europe Ltd. (UK)              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage 100.00%            
Janus International Europe Holdings Ltd. (UK) | Active Supply & Design (CDM) Ltd. (UK)              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage 100.00%            
Janus International Europe Holdings Ltd. (UK) | Steel Storage Australia & Steel Storage Asia              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage 100.00%            
Janus International Europe Holdings Ltd. (UK) | Steel Storage Australia & Steel Storage Asia              
Schedule of Equity Method Investments [Line Items]              
Interest acquired             100.00%
Janus Cobb Holdings, LLC | Asta Industries, Inc.              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage 100.00%            
Janus Cobb Holdings, LLC | Nokē, Inc.              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage 100.00%