Income Taxes (Reconciliation of Income Taxes) (Details)	12 Months Ended
Dec. 25, 2019	Dec. 26, 2018	Dec. 27, 2017
Reconciliation of income taxes at the U.S. federal statutory tax rate to effective tax rate:
Statutory provision rate	21.00%	21.00%	35.00%
State and local taxes, net of federal income tax benefit	8.00%	6.00%	5.00%
Reduction in state valuation allowance	(2.00%)	0.00%	0.00%
Wage addback on income tax credits earned	0.00%	0.00%	2.00%
General business credits generated	(2.00%)	(5.00%)	(5.00%)
Foreign tax credits generated	(1.00%)	(2.00%)	(2.00%)
Share-based compensation	(3.00%)	(3.00%)	(3.00%)
Impact of tax reform	0.00%	0.00%	(3.00%)
Other	0.00%	(1.00%)	1.00%
Effective tax rate	21.00%	16.00%	30.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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