DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt	$ 1,502,511	$ 1,504,549
Current portion of long-term debt	5,096	5,096
Long-term debt	1,497,415	1,499,453
Gross amount	1,507,012
Debt discount	4,501
Term Loan, due 2027
Debt Instrument [Line Items]
Total debt	502,511	504,549
Gross amount	507,000	509,600
Debt discount	4,500	5,000
Summit Materials, LLC
Debt Instrument [Line Items]
Total debt	1,502,511	1,504,549
Current portion of long-term debt	5,096	5,096
Long-term debt	1,497,415	1,499,453
Gross amount	1,507,012
Debt discount	4,501
Summit Materials, LLC | Term Loan, due 2027
Debt Instrument [Line Items]
Total debt	502,511	504,549
Gross amount	507,000	509,600
Debt discount	4,500	5,000
Senior Notes | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Total debt	$ 300,000	300,000
Debt instrument interest rate (as a percent)	6.50%
Senior Notes | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Total debt	$ 700,000	700,000
Debt instrument interest rate (as a percent)	5.25%
Senior Notes | Summit Materials, LLC | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Total debt	$ 300,000	300,000
Debt instrument interest rate (as a percent)	6.50%
Senior Notes | Summit Materials, LLC | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Total debt	$ 700,000	$ 700,000
Debt instrument interest rate (as a percent)	5.25%