Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Property and equipment [Line Items]
Land	$ 6,316us-gaap_Land	$ 4,879us-gaap_Land
Owned buildings	8,335us-gaap_BuildingsAndImprovementsGross	7,545us-gaap_BuildingsAndImprovementsGross
Leasehold improvements	185,109us-gaap_LeaseholdImprovementsGross	149,268us-gaap_LeaseholdImprovementsGross
Equipment	170,053us-gaap_MachineryAndEquipmentGross	162,854us-gaap_MachineryAndEquipmentGross
Assets subject to capital leases	16,018us-gaap_CapitalLeasedAssetsGross	16,121us-gaap_CapitalLeasedAssetsGross
Propert and equipment, gross	385,831us-gaap_PropertyPlantAndEquipmentGross	340,667us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	(206,448)	(188,492)
Property and equipment, net	179,383us-gaap_PropertyPlantAndEquipmentNet	152,175us-gaap_PropertyPlantAndEquipmentNet
Capital leases, accumulated depreciation	8,168	7,346
Depreciation expense	36,923	33,594	26,321
Property and Equipment [Member]
Property and equipment [Line Items]
Depreciation expense	$ 31,372	$ 28,364	$ 21,632

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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