Accrued Mining and Landfill Reclamation (Tables)

12 Months Ended

Dec. 30, 2017

Activity for Asset Retirement Obligations

	2017		2016
Beginning balance	$	23,906	$	20,735
Acquired obligations		2,303		835
Change in cost estimate		(1,764)		3,055
Settlement of reclamation obligations		(1,996)		(2,283)
Accretion expense		1,880		1,564
Ending balance	$	24,329	$	23,906

Summit Materials, LLC

Activity for Asset Retirement Obligations

	2017		2016
Beginning balance	$	23,906	$	20,735
Acquired obligations		2,303		835
Change in cost estimate		(1,764)		3,055
Settlement of reclamation obligations		(1,996)		(2,283)
Accretion expense		1,880		1,564
Ending balance	$	24,329	$	23,906