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FAIR VALUE - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Financial Instruments    
Current portion of debt $ 7,942 $ 7,942
Summit Materials, LLC    
Financial Instruments    
Current portion of debt 7,942 7,942
Level 2    
Financial Instruments    
Current portion of debt 7,900 7,900
Level 2 | Fair Value    
Financial Instruments    
Long-term debt 1,939,247 1,918,720
Level 2 | Carrying Value    
Financial Instruments    
Long-term debt 1,918,545 1,872,273
Level 2 | Summit Materials, LLC    
Financial Instruments    
Current portion of debt 7,900 7,900
Level 2 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Long-term debt 1,939,247 1,918,720
Level 2 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Long-term debt 1,918,545 1,872,273
Level 3 | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 31,443 30,733
Long term portion of deferred consideration and noncompete obligations 11,573 18,499
Level 3 | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 31,443 30,733
Long term portion of deferred consideration and noncompete obligations 11,573 18,499
Level 3 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 29,067 28,233
Long term portion of deferred consideration and noncompete obligations 11,573 16,364
Level 3 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 29,067 28,233
Long term portion of deferred consideration and noncompete obligations $ 11,573 $ 16,364