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Acquisitions (Narrative) (Details) $ in Thousands											2 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	Jan. 31, 2016 store	Dec. 13, 2015 store	Aug. 16, 2015 store	Jul. 12, 2015 store	Apr. 25, 2015 store	Dec. 07, 2014 store	Sep. 28, 2014 store	Aug. 08, 2014 store	Jun. 15, 2014 store	Apr. 13, 2014 store	Aug. 31, 2015 store item	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)	Dec. 31, 2014 agreement store	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)
Business Acquisition [Line Items]
Number of stores acquired														4
Number of separate transactions | agreement														4
Number of stores never opened									2
Costs related to acquisitions | $												$ 100	$ 300		$ 600	$ 900
Sales for acquired entities | $												$ 9,600	$ 18,800		15,600	29,500
Change in estimates, property, plant and equipment | $															3,600
Change in estimates, intangible assets | $															(1,700)
Change in estimates, long-term deferred income tax assets | $															1,500
Change in current liabilities | $															700
Change in estimates, long-term capital leases and financing obligations | $															7,200
Change in estimates, Purchase price adjustment | $															400
Adjustments to goodwill related to purchase accounting | $															4,100
Subsequent Event [Member]
Business Acquisition [Line Items]
Number of stores acquired	1
Former Car-X Franchised Stores Acquisitions [Member]
Business Acquisition [Line Items]
Number of stores acquired											3
Number of franchisees | item											2
Car-X Associates Corp. Acquisition [Member]
Business Acquisition [Line Items]
Number of franchisees					32
Number of franchise rights					146
Hennelly Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired								35
Lentz Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired									10
Kan Rock Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired									9
Bald Tire Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired										2
Wood & Fullerton Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired							9
Gold Coast Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired						9
Windsor Tire Co. Aquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired				4
Kost Tire [Member]
Business Acquisition [Line Items]
Number of stores acquired			27
Fiscal 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred | $																$ 82,709
Fiscal 2016 Aquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred | $															50,769
Total consideration transferred, portion in cash | $															44,800
Total consideration transferred, portion payable | $															$ 6,000
WISCONSIN
Business Acquisition [Line Items]
Number of stores acquired		4
FLORIDA
Business Acquisition [Line Items]
Number of stores acquired		1

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