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Goodwill - Summary of Goodwill by Reportable Segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Goodwill [Roll Forward]    
Beginning balance $ 1,201,291 $ 1,199,699
Acquisitions   19
Dispositions (38,063)  
Foreign currency translation adjustments 522 1,573
Ending balance 1,163,750 1,201,291
Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 1,202,291 1,200,699
Acquisitions   19
Dispositions (38,063)  
Foreign currency translation adjustments 522 1,573
Ending balance 1,164,750 1,202,291
West    
Goodwill [Roll Forward]    
Beginning balance 586,209 584,617
Acquisitions   19
Dispositions (16,222)  
Foreign currency translation adjustments 522 1,573
Ending balance 570,509 586,209
West | Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 587,209 585,617
Acquisitions   19
Dispositions (16,222)  
Foreign currency translation adjustments 522 1,573
Ending balance 571,509 587,209
East    
Goodwill [Roll Forward]    
Beginning balance 410,426 410,426
Acquisitions   0
Dispositions (21,841)  
Foreign currency translation adjustments 0 0
Ending balance 388,585 410,426
East | Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 410,426 410,426
Acquisitions   0
Dispositions (21,841)  
Foreign currency translation adjustments 0 0
Ending balance 388,585 410,426
Cement    
Goodwill [Roll Forward]    
Beginning balance 204,656 204,656
Acquisitions   0
Dispositions 0  
Foreign currency translation adjustments 0 0
Ending balance 204,656 204,656
Cement | Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 204,656 204,656
Acquisitions   0
Dispositions 0  
Foreign currency translation adjustments 0 0
Ending balance $ 204,656 $ 204,656