Leases (Details) (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Leases [Abstract]
Store leases periods, minimum (in years)	10 years
Store leases periods, maximum (in years)	15 years
Store leases optional renewal periods, minimum	2
Store leases optional renewal periods, maximum	4
Store leases optional renewal periods (in years)	5
Operating Leases, Rent Expense, Net	$ 239,300,000us-gaap_OperatingLeasesRentExpenseNet	$ 216,800,000us-gaap_OperatingLeasesRentExpenseNet	$ 200,100,000us-gaap_OperatingLeasesRentExpenseNet
Aggregate capital leases future minimum payments due
2015	537,000
2016	537,000
2017	537,000
2018	537,000
2019	537,000
Thereafter	5,364,000
Total minimum payments due	8,049,000
Amount representing interest	(2,879,000)
Present value of minimum lease payments	5,170,000
Less: current portion	(213,000)us-gaap_CapitalLeaseObligationsCurrent	(42,000)us-gaap_CapitalLeaseObligationsCurrent
Long-term capital lease obligations	4,957,000	1,200,000
Aggregate operating lease future minimum payments due
2015	243,864,000
2016	236,943,000
2017	225,404,000
2018	215,190,000
2019	202,099,000
Thereafter	952,557,000
Total minimum lease payments	2,076,057,000
Building improvements
Capital Leases, Balance Sheet, Assets by Major Class, Net
Capital Leased Assets, Gross	5,623,000	1,581,000
Less: accumulated depreciation and amortization	(935,000)	(782,000)
Capital leased assets, Net	$ 4,688,000	$ 799,000

The store leases optional renewal periods.

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The maximum number of store leases optional renewals.

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The minimum number of store leases optional renewals.

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The maximum period upon which an operating lease or a group of leases is set to expire.

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The minimum period upon which an operating lease or a group of leases is set to expire.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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