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Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Financial Instruments    
Current portion of debt $ 6,354 $ 4,765
Summit Materials, LLC    
Financial Instruments    
Current portion of debt 6,354 4,765
Level 3 | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 32,876 13,493
Long term portion of deferred consideration and noncompete obligations 44,293 23,834
Level 3 | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 32,876 13,493
Long term portion of deferred consideration and noncompete obligations 44,293 23,834
Level 3 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 30,376 10,993
Long term portion of deferred consideration and noncompete obligations 40,179 17,938
Level 3 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 30,376 10,993
Long term portion of deferred consideration and noncompete obligations 40,179 17,938
Level 2    
Financial Instruments    
Current portion of debt   4,800
Level 2 | Fair Value    
Financial Instruments    
Long-term debt 1,777,722 1,893,239
Current portion of debt 6,400  
Level 2 | Carrying Value    
Financial Instruments    
Long-term debt 1,828,159 1,832,455
Level 2 | Summit Materials, LLC    
Financial Instruments    
Current portion of debt 6,400 4,800
Level 2 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Long-term debt 1,777,722 1,893,239
Level 2 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Long-term debt $ 1,828,159 $ 1,832,455