Commitments and Contingencies - Summary of Asset Retirement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2016	Jun. 28, 2015	May 31, 2016	Jun. 28, 2015
Commitments And Contingencies Disclosure [Abstract]
Balance at the beginning of the period	$ 10,658	$ 903	$ 9,992	$ 0
ARO assumed in acquisition	981	2,130	1,528	2,130
Accretion expense	127	0	246	0
Liabilities incurred during the period	0	3,667	0	4,570
Adjustments to ARO during the period	(224)	0	(224)	0
Balance at the end of the period	$ 11,542	$ 6,700	$ 11,542	$ 6,700