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Goodwill - Summary of Goodwill by Reportable Segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Goodwill [Roll Forward]    
Beginning balance $ 1,036,320 $ 782,212
Acquisitions 160,579 249,958
Foreign currency translation adjustments 4,871 (4,150)
Ending balance 1,192,028 1,036,320
Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 1,037,320 782,212
Acquisitions 160,579 250,958
Foreign currency translation adjustments 4,871 4,150
Ending balance 1,193,028 1,037,320
West    
Goodwill [Roll Forward]    
Beginning balance 526,290 334,257
Acquisitions 59,148 187,883
Foreign currency translation adjustments 4,871 (4,150)
Ending balance 580,567 526,290
West | Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 527,290 334,257
Acquisitions 59,148 188,883
Foreign currency translation adjustments 4,871 4,150
Ending balance 581,567 527,290
East    
Goodwill [Roll Forward]    
Beginning balance 305,374 243,417
Acquisitions 101,431 61,957
Foreign currency translation adjustments 0 0
Ending balance 406,805 305,374
East | Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 305,374 243,417
Acquisitions 101,431 61,957
Foreign currency translation adjustments 0 0
Ending balance 406,805 305,374
Cement    
Goodwill [Roll Forward]    
Beginning balance 204,656 204,538
Acquisitions 0 118
Foreign currency translation adjustments 0 0
Ending balance 204,656 204,656
Cement | Summit Materials, LLC    
Goodwill [Roll Forward]    
Beginning balance 204,656 204,538
Acquisitions 0 118
Foreign currency translation adjustments 0 0
Ending balance $ 204,656 $ 204,656