Acquisitions (Details) (USD $)	3 Months Ended	9 Months Ended
	Dec. 29, 2012	Dec. 29, 2012
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Inventory	$ 18,573,000	$ 18,573,000
Other current assets	1,215,000	1,215,000
Intangible assets	13,114,000	13,114,000
Other noncurrent assets	25,139,000	25,139,000
Current liabilities	(5,261,000)	(5,261,000)
Long-term liabilities	(1,977,000)	(1,977,000)
Net identifiable assets acquired	50,803,000	50,803,000
Total consideration transferred	146,209,000	146,209,000
Net identifiable assets acquired	50,803,000	50,803,000
Goodwill	95,406,000	95,406,000
Goodwill reduction for the sale of Kramer assets		700,000
Total costs related to acquisitions	900,000	1,600,000
Sales for the fiscal 2013 acquired entities	21,700,000	42,800,000
Kramer Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		25,000,000
Number of stores acquired		20
Number of heavy truck stores acquired		2
Number of wholesale operations acquired		2
Number of retread facilities acquired		1
Number of heavy truck stores disposed		2
Colony Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		25,000,000
Number of stores acquired		18
Tuffy Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		9,000,000
Number of stores acquired		17
Brothers Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		1,000,000
Number of stores acquired		1
Chesley Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		3,000,000
Number of stores acquired		5
Tire Barn Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		64,000,000
Number of stores acquired		31
Towery Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		54,000,000
Number of stores acquired		27
Tire King Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		11,000,000
Number of stores acquired		9
Enger Acquisition [Member]
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		$ 9,000,000
Number of stores acquired		12