Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Segment Information (Detail)

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Summary of Significant Accounting Policies - Segment Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 25, 2021
Sep. 25, 2020
Sep. 25, 2021
Sep. 25, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income $ 25,225,180 $ 29,506,976 $ 60,663,994 $ 69,826,031
Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income 25,225,180   60,663,994  
Previously Reported | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income 25,225,180   63,814,764  
Revision of Prior Period, Adjustment [Member] | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     (3,150,770)  
Reportable geographical components | Janus North America        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income 24,381,786 28,108,223 64,878,335 67,754,630
Reportable geographical components | Janus North America | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     64,878,335  
Reportable geographical components | Janus North America | Previously Reported | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     60,884,392  
Reportable geographical components | Janus North America | Revision of Prior Period, Adjustment [Member] | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     3,993,943  
Reportable geographical components | Janus International        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income 819,333 1,362,916 (4,263,137) 1,980,835
Reportable geographical components | Janus International | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     (4,263,137)  
Reportable geographical components | Janus International | Previously Reported | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     2,881,576  
Reportable geographical components | Janus International | Revision of Prior Period, Adjustment [Member] | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     (7,144,713)  
Intersegment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income $ 24,061 $ 35,837 48,796 $ 90,566
Intersegment | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     48,796  
Intersegment | Previously Reported | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     48,796  
Operating Segments | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     60,663,994  
Operating Segments | Previously Reported | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     63,814,764  
Operating Segments | Revision of Prior Period, Adjustment [Member] | Transaction Bonus Related To Business Combination        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total Segment Operating Income     $ (3,150,770)