Consolidated Statements of Comprehensive Operations - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Net income (loss)	$ (55,108)	$ (42,534)
Other comprehensive income (loss):
Foreign currency translation adjustment	706	4,642
Income (loss) on cash flow hedges	412	(2,234)
Other comprehensive income (loss)	1,118	2,408
Comprehensive loss	(53,990)	(40,126)
Less comprehensive loss attributable to the noncontrolling interest in consolidated subsidiaries	(98)	(79)
Less comprehensive loss attributable Summit Holdings	(2,511)	(20,127)
Comprehensive loss attributable to Summit Materials, Inc. / Summit Materials, LLC	(51,381)	(19,920)
Summit Materials, LLC
Net income (loss)	(54,854)	(42,243)
Other comprehensive income (loss):
Foreign currency translation adjustment	706	4,642
Income (loss) on cash flow hedges	412	(2,234)
Other comprehensive income (loss)	1,118	2,408
Comprehensive loss	(53,736)	(39,835)
Less comprehensive loss attributable to noncontrolling interest	(98)	(79)
Comprehensive loss attributable to Summit Materials, Inc. / Summit Materials, LLC	$ (53,638)	$ (39,756)