Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Current tax expense/(benefit)
Federal									$ 22,864	$ 41,199	$ 17,397
Foreign									312	485	583
State and local									(3,295)	5,919	(25,625)
Total current tax expense/(benefit)									19,881	47,603	(7,645)
Deferred tax expense
Federal									(16,625)	(14,554)	4,014
State and local									1,165	861	90
Total deferred tax (benefit)/expense									(15,460)	(13,693)	4,104
Income tax expense/(benefit)	$ 13,377	$ 121	$ 124	$ (9,201)	$ 28,006	$ 3,611	$ 11,700	$ (9,407)	4,421	33,910	$ (3,541)
Operating loss carryforward, State and local	$ 3,400				$ 3,800				$ 3,400	$ 3,800
Maximum [Member]
Deferred tax expense
Operating loss carryforwards, remaining life									17 years