Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Current tax expense/(benefit)
Federal									$ (252)	$ 22,864	$ 41,199
Foreign									458	312	485
State and local									350	(3,295)	5,919
Total current tax expense									556	19,881	47,603
Deferred tax expense
Federal									105,905	(16,625)	(14,554)
State and local									(2,505)	1,165	861
Total deferred tax expense/(benefit)									103,400	(15,460)	(13,693)
Income tax expense/(benefit)	$ 63,083	$ 23,420	$ 6,711	$ 10,742	$ 13,377	$ 121	$ 124	$ (9,201)	103,956	4,421	$ 33,910
Operating loss carryforward, state and local	$ 4,700				$ 3,400				$ 4,700	$ 3,400
Maximum [Member]
Deferred tax expense
Operating loss carryforwards, remaining life									20