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Net Earnings Per Share - Schedule of Basic to Diluted Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Reconciliation of basic to diluted loss per share                      
Net income (loss) attributable to Summit Inc. $ 43,010 $ 81,264 $ 50,000 $ (52,444) $ (290) $ 44,820 $ 13,371 $ (21,118) $ 121,830 $ 36,783 $ 27,718
Add: Noncontrolling interest impact of LP Unit conversion                     17,803
Diluted net income attributable to Summit Inc.                 $ 121,830 $ 36,783 $ 45,521
LP Units                      
Reconciliation of basic to diluted loss per share                      
Add: weighted average of LP Units                     50,059,648
Anti dilutive shares excluded from calculation of earnings per share                 4,371,705 32,327,907  
Stock options                      
Reconciliation of basic to diluted loss per share                      
Add: Share-based payment arrangements                 308,355 140,142  
Anti dilutive shares excluded from calculation of earnings per share                     2,265,584
Warrants                      
Reconciliation of basic to diluted loss per share                      
Add: warrants                 42,035 16,123 37,714
Restricted stock                      
Reconciliation of basic to diluted loss per share                      
Add: Share-based payment arrangements                 308,221 240,633 7,523
Performance stock units                      
Reconciliation of basic to diluted loss per share                      
Add: Share-based payment arrangements                 135,849 86,568  
Common Class A                      
Reconciliation of basic to diluted loss per share                      
Weighted average shares of Class A common stock outstanding                 108,696,438 70,355,042 40,888,437
Basic income (loss) per share                 $ 1.12 $ 0.52 $ 0.68
Weighted average dilutive shares outstanding                 109,490,898 70,838,508 90,993,322
Diluted earnings per share                 $ 1.11 $ 0.52 $ 0.50
Summit Materials, LLC                      
Reconciliation of basic to diluted loss per share                      
Net income (loss) attributable to Summit Inc.                 $ 134,068 $ 62,071 $ 4,182