Income Taxes (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 27, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Valuation Allowance		$ 0	$ 0
Tax Credit Carryforward, Amount		4,400,000	5,000,000
Current tax expense
Federal		225,253,000	211,383,000	$ 175,039,000
State		17,419,000	25,133,000	19,129,000
Total current		242,672,000	236,516,000	194,168,000
Deferred tax expense (benefit)
Deferred Federal Income Tax Expense (Benefit)		(7,017,000)	(14,493,000)	(5,341,000)
Deferred State and Local Income Tax Expense (Benefit)		1,567,000	(5,321,000)	(2,968,000)
Total deferred taxes		(5,450,000)	(19,814,000)	(8,309,000)
Total provision		237,222,000	216,702,000	185,859,000
Current tax assets
Inventory valuation		18,147,000	16,602,000
Accrued employee benefit costs		21,368,000	18,770,000
Accrued sales tax audit reserve		2,316,000	2,053,000
Other		10,369,000	11,585,000
Total current deferred tax assets		52,200,000	49,010,000
Current tax liabilities
Inventory basis difference		(3,497,000)	(4,657,000)
Prepaid Expenses		(2,108,000)	(2,109,000)
Other		(625,000)	(1,282,000)
Total current deferred tax liability		(6,230,000)	(8,048,000)
Net current tax asset		45,970,000	40,962,000
Non-current tax assets
Rent expenses in excess of cash payments required		29,179,000	27,166,000
Deferred compensation		20,125,000	17,956,000
Workers compensation insurance		7,233,000	6,989,000
General liability insurance		3,141,000	2,741,000
Lease exit obligation		2,378,000	2,437,000
Income tax credits		825,000	2,205,000
Accrued sales tax audit reserve		2,505,000	2,085,000
Other		3,274,000	3,745,000
Total non current deferred tax asset		68,660,000	65,324,000
Non-current tax liabilities
Depreciation		(55,805,000)	(52,626,000)
Other		(3,631,000)	(3,916,000)
Total non current deferred tax liabilities		(59,436,000)	(56,542,000)
Deferred tax assets net noncurrent		9,224,000	8,782,000
Net deferred tax asset		55,194,000	49,744,000
Provision for income tax reconciliation to amounts computed at the federal statutory rate
Tax provision at statutory rate		226,666,000	205,656,000	179,933,000
State income taxes, net of federal tax benefits		12,341,000	12,878,000	10,505,000
Permanent differences		(1,785,000)	(1,832,000)	(4,579,000)
Total provision		237,222,000	216,702,000	185,859,000
Unrecognized tax benefits that would Impact effective tax rate		1,900,000
Reconciliation of gross unrecognized tax benefits
Balance at beginning of period	$ 2,482,000	3,500,000	2,482,000	5,898,000
Additions based on tax positions related to the current period	1,104,000	869,000		741,000
Additions for tax positions of prior periods	280,000	0		0
Reductions for tax positions of prior periods	(366,000)	(1,447,000)		(3,937,000)
Reductions due to audit results	$ 0	0		(220,000)
Balance at end of period		2,922,000	$ 3,500,000	$ 2,482,000
Overall decrease in unrecognized tax benefits, minimum		200,000
Overall decrease in unrecognized tax benefits, maximum		$ 600,000

The tax effect as of the balance sheet date of the current portion of the amount of the estimated future tax effects arising from sales tax audits, which can only be deducted for tax purposes when losses pertaining to such taxes are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.