LEASES - Operating and Finance Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022	Dec. 31, 2022
Lease, Cost [Abstract]
Operating lease cost	$ 2,641	$ 2,512
Variable lease cost	30	113
Short-term lease cost	7,270	8,248
Financing lease cost:
Amortization of right-of-use assets	818	1,986
Interest on lease liabilities	148	369
Total lease cost	10,907	13,228
Operating leases:
Operating lease right-of-use assets	36,638		$ 37,889
Current operating lease liabilities	7,515		7,296
Noncurrent operating lease liabilities	34,315		35,737
Total operating lease liabilities	41,830		43,033
Finance leases:
Property and equipment, gross	24,565		32,119
Less accumulated depreciation	$ (11,279)		$ (14,992)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net
Property and equipment, net	$ 13,286		$ 17,127
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses		Accrued expenses
Current finance lease liabilities	$ 4,224		$ 6,959
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities		Other noncurrent liabilities
Long-term finance lease liabilities	$ 6,303		$ 7,167
Total finance lease liabilities	$ 10,527		$ 14,126
Weighted average remaining lease term (years):
Operating leases	9 years		9 years 1 month 6 days
Finance lease	3 years 6 months		2 years 9 months 18 days
Weighted average discount rate:
Operating leases	4.70%		4.70%
Finance leases	5.60%		5.30%
Operating Leases
2023 (nine months)	$ 6,929
2024	8,289
2025	6,377
2026	5,009
2027	4,161
2028	3,223
Thereafter	16,787
Total lease payments	50,775
Less imputed interest	(8,945)
Present value of lease payments	41,830		$ 43,033
Finance Leases
2023 (nine months)	3,106
2024	3,433
2025	2,435
2026	990
2027	760
2028	513
Thereafter	570
Total lease payments	11,807
Less imputed interest	(1,280)
Present value of lease payments	10,527		14,126
Summit Materials, LLC
Lease, Cost [Abstract]
Operating lease cost	2,641	2,512
Variable lease cost	30	113
Short-term lease cost	7,270	8,248
Financing lease cost:
Amortization of right-of-use assets	818	1,986
Interest on lease liabilities	148	369
Total lease cost	10,907	$ 13,228
Operating leases:
Operating lease right-of-use assets	36,638		37,889
Current operating lease liabilities	7,515		7,296
Noncurrent operating lease liabilities	34,315		35,737
Total operating lease liabilities	41,830		43,033
Finance leases:
Property and equipment, gross	24,565		32,119
Less accumulated depreciation	$ (11,279)		$ (14,992)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net
Property and equipment, net	$ 13,286		$ 17,127
Current finance lease liabilities	4,224		6,959
Long-term finance lease liabilities	6,303		7,167
Total finance lease liabilities	$ 10,527		$ 14,126
Weighted average remaining lease term (years):
Operating leases	9 years		9 years 1 month 6 days
Finance lease	3 years 6 months		2 years 9 months 18 days
Weighted average discount rate:
Operating leases	4.70%		4.70%
Finance leases	5.60%		5.30%
Operating Leases
2023 (nine months)	$ 6,929
2024	8,289
2025	6,377
2026	5,009
2027	4,161
2028	3,223
Thereafter	16,787
Total lease payments	50,775
Less imputed interest	(8,945)
Present value of lease payments	41,830		$ 43,033
Finance Leases
2023 (nine months)	3,106
2024	3,433
2025	2,435
2026	990
2027	760
2028	513
Thereafter	570
Total lease payments	11,807
Less imputed interest	(1,280)
Present value of lease payments	$ 10,527		$ 14,126