Acquisitions (Narrative) (Details) $ in Thousands							2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 16, 2015 store	Jul. 12, 2015 store	Apr. 25, 2015 store	Aug. 08, 2014 store	Jun. 15, 2014 store	Apr. 13, 2014 store	Aug. 31, 2015 store	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Sep. 26, 2015 USD ($) item	Sep. 27, 2014 USD ($)	Mar. 28, 2015 USD ($)
Business Acquisition [Line Items]
Number of stores never opened | store					2
Costs related to acquisitions								$ 300	$ 300	$ 500	$ 700
Sales for acquired entities								$ 5,300	$ 9,700	$ 6,000	10,600
Change in estimates, property, plant and equipment												$ 3,000
Change in estimates, intangible assets												(1,900)
Change in estimates, long-term deferred income tax assets												1,400
Change in current liabilities												700
Change in estimates, long-term capital leases and financing obligations												6,700
Change in estimates, various assets and liabilites, net												100
Adjustments to goodwill related to purchase accounting												$ 4,800
Former Car-X Franchised Stores Acquisitions [Member]
Business Acquisition [Line Items]
Number of stores acquired | store							3
Number of franchisees | item										2
Car-X Associates Corp. Acquisition [Member]
Business Acquisition [Line Items]
Number of franchisees | store			32
Number of franchise rights | store			146
Hennelly Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired | store				35
Lentz Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired | store					10
Kan Rock Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired | store					9
Bald Tire Acquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired | store						2
Windsor Tire Co. Aquisition [Member]
Business Acquisition [Line Items]
Number of stores acquired | store		4
Kost Tire [Member]
Business Acquisition [Line Items]
Number of stores acquired | store	27
Fiscal 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred											$ 64,293
Fiscal 2016 Aquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred										$ 49,425
Total consideration transferred, portion in cash										43,400
Total consideration transferred, portion payable										$ 6,000