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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Oct. 02, 2021
Jan. 02, 2021
Accumulated depreciation, depletion and amortization $ 1,234,171 $ 1,132,925
Accumulated amortization 14,309 11,864
Valuation allowance 1,675 1,675
Summit Materials, LLC    
Accumulated depreciation, depletion and amortization 1,234,171 1,132,925
Accumulated amortization $ 14,309 $ 11,864
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) 118,564,950 114,390,595
Common stock, shares outstanding (in shares) 118,564,950 114,390,595
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