Income Taxes - Rate Reconciliation (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
Effective Income Tax Rate Reconciliation, Amount:
Tax at federal statutory rate									$ 38,928	$ 10,685	$ 33,863
State and local taxes, net									4,800	3,095	5,093
Effect of enacted changes in tax laws									68,747	0	1,801
Reduction in uncertain tax positions									(2,277)	(4,534)	(2,545)
Loss/(gain) on Company-owned life insurance									(1,916)	(736)	75
Nondeductible expense, net									1,021	1,115	880
Domestic manufacturing deduction									0	(1,820)	(2,651)
Foreign Earnings and Dividends									458	(2,418)	(1,214)
Other, net									(5,805)	(966)	(1,392)
Income tax expense/(benefit)	$ 63,083	$ 23,420	$ 6,711	$ 10,742	$ 13,377	$ 121	$ 124	$ (9,201)	$ 103,956	$ 4,421	$ 33,910
Effective Income Tax Rate Reconciliation, Percent:
Tax at federal statutory rate (% of pre-tax)									35.00%	35.00%	35.00%
State and local taxes, net (% of pre-tax)									4.30%	10.10%	5.20%
Effect of enacted changes in tax laws (% of pre-tax)									61.80%	0.00%	1.80%
Reduction in uncertain tax positions (% of pre-tax)									(2.00%)	(14.90%)	(2.60%)
Loss/(gain) on Company-owned life insurance (% of pre-tax)									(1.70%)	(2.40%)	0.10%
Non deductible expense, net (% of pre-tax)									0.90%	3.70%	0.90%
Domestic manufacturing deduction (% of pre-tax)									(0.00%)	(6.00%)	(2.70%)
Foreign Earnings and Dividends (% of pre-tax)									0.40%	(7.90%)	(1.30%)
Other, net (% of pre-tax)									(5.20%)	(3.20%)	(1.40%)
Effective income tax rate									93.50%	14.40%	35.00%