Income Taxes (Reconciliation of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016	Dec. 28, 2011
Reconciliation of income taxes at the U.S. federal statutory tax rate to effective tax rate:
U.S. statutory tax rate	21.00%	35.00%	35.00%
State and local taxes, net of federal income tax benefit	6.00%	5.00%	9.00%
Wage addback on income tax credits earned	0.00%	2.00%	3.00%
General business credits generated	(5.00%)	(5.00%)	(9.00%)
Foreign tax credits generated	(2.00%)	(2.00%)	(12.00%)
Pension plan liquidation	0.00%	0.00%	18.00%
Share-based compensation	(3.00%)	(3.00%)	(0.00%)
Impact of tax reform	(0.00%)	(3.00%)	(0.00%)
Other	(1.00%)	1.00%	2.00%
Effective tax rate	16.00%	30.00%	46.00%
Net tax benefit recognized related to the Tax Act		$ 1,600
Tax benefit recognized related to share-based compensation	$ 1,400	1,700
Tax benefit recognized with pension plan liquidation			$ 2,100
Pension settlement loss		(21)	(24,297)
Tax benefit recognized with reversal of the valuation allowance	$ (121)	$ (216)	(132)	$ 7,200
Tax benefit recognized with foreign tax credits			$ 3,700