Acquisitions (Narrative) (Details)	1 Months Ended	3 Months Ended
	Aug. 07, 2019 entity	Jun. 29, 2019 USD ($) warehouse property store entity	Jun. 30, 2018 USD ($)
Business Acquisition [Line Items]
Store acquisitions related to acquisition growth strategy | property		5
Costs related to completed acquisitions		$ 500,000	$ 200,000
Sales for acquired entities		7,100,000	5,400,000
Total consideration transferred		54,500,000	$ 27,167,000
Change in estimates, inventories		(300,000)
Change in estimates, property, plant and equipment		100,000
Change in estimates, finance lease assets		(800,000)
Change in estimates, intangible assets		(300,000)
Change in estimates, other current assets		100,000
Change in estimates, long-term deferred income tax assets		300,000
Change in estimates, current portion of finance leases and financing obligations		(200,000)
Change in estimates, long-term finance leases and financing obligations		(2,400,000)
Adjustments to goodwill related to purchase accounting		$ (700,000)
Subsequent Event [Member]
Business Acquisition [Line Items]
Number of acquisitions | entity	8
Maximum [Member]
Business Acquisition [Line Items]
Store acquisitions related to greenfield store growth strategy | property		4
Minimum [Member]
Business Acquisition [Line Items]
Store acquisitions related to greenfield store growth strategy | property		1
BAW LLC [Member]
Business Acquisition [Line Items]
Acquisition date		Jun. 23, 2019
Number of stores acquired | store		2
Certified Tire And Service Centers, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date		May 19, 2019
Number of stores acquired | store		40
Number of distribution center | warehouse		1
Allied Discount Tire And Brake, Inc [Member]
Business Acquisition [Line Items]
Acquisition date		Mar. 31, 2019
Number of stores acquired | store		12
Free Service Tire Company, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date		May 13, 2018
Number of stores acquired | store		12
Liberty Auto Group, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date		Apr. 01, 2018
Number of stores acquired | store		4
Fiscal 2020 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred		$ 54,505,000
Standby Letters of Credit [Member]
Business Acquisition [Line Items]
Revolving credit facility agreement		$ 80,000,000
Standby Letters of Credit [Member] | Maximum [Member] | LIBOR [Member]
Business Acquisition [Line Items]
Interest rate over LIBOR on the facility		2.125%
Standby Letters of Credit [Member] | Minimum [Member] | LIBOR [Member]
Business Acquisition [Line Items]
Interest rate over LIBOR on the facility		0.875%
Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Credit facility term		5 years
Revolving credit facility agreement		$ 600,000,000
Number of banks involved in credit facility | entity		8
Credit facility, Potential increased availability		$ 250,000,000
Revolving Credit Facility [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of face amount of standby letter of credit payable as fees		0.35%
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]
Business Acquisition [Line Items]
Interest rate over LIBOR on the facility		2.00%
Revolving Credit Facility [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of face amount of standby letter of credit payable as fees		0.125%
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]
Business Acquisition [Line Items]
Interest rate over LIBOR on the facility		0.75%