Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Property, plant and equipment, accumulated depreciation, depletion and amortization	$ 631,841	$ 484,554
Intangible assets, accumulated amortization	6,698	7,854
Valuation allowance	1,675	502,839
Summit Materials, LLC
Property, plant and equipment, accumulated depreciation, depletion and amortization	631,841	484,554
Intangible assets, accumulated amortization	6,698	7,854
Valuation allowance	$ 1,675	$ 2,677
Common Class A
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	110,350,594	96,033,222
Common stock, shares outstanding	110,350,594	96,033,222
Common Class B
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100