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FAIR VALUE - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Financial Instruments    
Current portion of debt $ 4,765 $ 6,354
Summit Materials, LLC    
Financial Instruments    
Current portion of debt 4,765 6,354
Level 2    
Financial Instruments    
Current portion of debt 4,800 6,400
Level 2 | Fair Value    
Financial Instruments    
Long-term debt 1,895,932 1,777,722
Level 2 | Carrying Value    
Financial Instruments    
Long-term debt 1,873,627 1,828,159
Level 2 | Summit Materials, LLC    
Financial Instruments    
Current portion of debt 4,800 6,400
Level 2 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Long-term debt 1,895,932 1,777,722
Level 2 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Long-term debt 1,873,627 1,828,159
Level 3 | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 32,848 32,876
Long term portion of deferred consideration and noncompete obligations 38,850 44,293
Level 3 | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 32,848 32,876
Long term portion of deferred consideration and noncompete obligations 38,850 44,293
Level 3 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 30,348 30,376
Long term portion of deferred consideration and noncompete obligations 36,951 40,179
Level 3 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 30,348 30,376
Long term portion of deferred consideration and noncompete obligations $ 36,951 $ 40,179