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Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 30, 2023
Dec. 31, 2022
Financial Instruments    
Current portion of debt $ 3,822 $ 5,096
Summit Materials, LLC    
Financial Instruments    
Current portion of debt 3,822 5,096
Level 1 | Fair Value    
Financial Instruments    
Long-term debt 2,329,606 1,447,673
Current portion of debt 3,800 5,100
Level 1 | Carrying Value    
Financial Instruments    
Long-term debt 2,300,473 1,504,549
Level 1 | Summit Materials, LLC    
Financial Instruments    
Current portion of debt 3,800 5,100
Level 1 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Long-term debt 2,329,606 1,447,673
Level 1 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Long-term debt 2,300,473 1,504,549
Level 3 | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 6,868 13,382
Long term portion of deferred consideration and noncompete obligations 18,767 24,070
Level 3 | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 6,868 13,382
Long term portion of deferred consideration and noncompete obligations 18,767 24,070
Level 3 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 6,868 13,382
Long term portion of deferred consideration and noncompete obligations 18,767 24,070
Level 3 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 6,868 13,382
Long term portion of deferred consideration and noncompete obligations $ 18,767 $ 24,070