Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 02, 2022	Jan. 01, 2022
Accumulated depreciation, depletion and amortization	$ 1,290,560	$ 1,266,513
Accumulated amortization	16,218	15,269
Valuation allowance	1,675	1,675
Summit Materials, LLC
Accumulated depreciation, depletion and amortization	1,290,560	1,266,513
Accumulated amortization	$ 16,218	$ 15,269
Common Class A
Common stock, par value (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)	118,041,848	118,705,108
Common stock, shares outstanding (in shares)	118,041,848	118,705,108
Common Class B
Common stock, par value (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)	99	99
Common stock, shares outstanding (in shares)		99