Consolidated Balance Sheets - Summit Materials Inc (Parenthetical) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Accumulated depreciation, depletion and amortization	$ 1,447,284	$ 1,267,557
Accumulated amortization	28,335	18,972
Valuation allowance	$ 1,113	$ 1,113
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	250,000,000	250,000,000
Preferred stock, shares outstanding (in shares)	1	0
Preferred stock, shares issued (in shares)	1	0
Common Class A
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	175,454,250	119,529,380
Common stock, shares outstanding (in shares)	175,454,250	119,529,380
Common Class B
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	0	99
Common stock, shares outstanding (in shares)	0	99