FAIR VALUE - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Financial Instruments
Current portion of long-term debt	$ 5,096	$ 5,096
Summit Materials, LLC
Financial Instruments
Current portion of long-term debt	5,096	5,096
Level 1 | Fair Value
Financial Instruments
Long-term debt	1,456,913	1,447,673
Level 1 | Carrying Value
Financial Instruments
Long-term debt	1,502,511	1,504,549
Level 1 | Summit Materials, LLC
Financial Instruments
Current portion of long-term debt	5,100	5,100
Level 1 | Summit Materials, LLC | Fair Value
Financial Instruments
Long-term debt	1,456,913	1,447,673
Level 1 | Summit Materials, LLC | Carrying Value
Financial Instruments
Long-term debt	1,502,511	1,504,549
Level 3 | Fair Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,907	13,382
Long term portion of deferred consideration and noncompete obligations	18,401	24,070
Level 3 | Carrying Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,907	13,382
Long term portion of deferred consideration and noncompete obligations	18,401	24,070
Level 3 | Summit Materials, LLC | Fair Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,907	13,382
Long term portion of deferred consideration and noncompete obligations	18,401	24,070
Level 3 | Summit Materials, LLC | Carrying Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,907	13,382
Long term portion of deferred consideration and noncompete obligations	18,401	24,070
Fair Value, Inputs, Level 1 | Fair Value
Financial Instruments
Current portion of long-term debt	$ 5,100	$ 5,100