Acquisitions (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 23, 2017 USD ($)	Sep. 24, 2016 USD ($)	Sep. 23, 2017 USD ($) store	Sep. 24, 2016 USD ($) store property
Business Acquisition [Line Items]
Costs related to completed acquisitions | $	$ 200	$ 200	$ 300	$ 400
Sales for acquired entities | $	$ 3,100	$ 14,300	3,600	22,000
Total consideration transferred, portion in cash | $				129,000
Payable to a seller | $				$ 100
Change in estimates, property, plant and equipment | $			1,200
Change in estimates, intangible assets | $			(2,000)
Change in estimates, long-term deferred income tax assets | $			(300)
Change in current liabilities | $			(100)
Change in estimates, long-term capital leases and financing obligations | $			200
Adjustments to goodwill related to purchase accounting | $			$ 1,200
Auto MD, LLC. [Member]
Business Acquisition [Line Items]
Acquisition date			Aug. 13, 2017
Number of stores acquired			8
UVR, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Jul. 30, 2017
Number of stores acquired, both operating and not opened			13
Number of stores acquired			12
Number of stores never opened			1
Norman Young Tires, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Jul. 09, 2017
Number of stores acquired			1
D&S Pulaski, LLC. [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 25, 2017
Number of stores acquired			1
J & R Diversified, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 11, 2017
Number of stores acquired			2
Michael N. McGroarty, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 11, 2017
Number of stores acquired			1
Tires Plus LLC. [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 02, 2017
Number of stores acquired			1
Bob Sumerel Tire Co., Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			May 21, 2017
Number of stores acquired			1
Collier Automotive Group, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Apr. 23, 2017
Number of stores acquired			1
Florida Tire Service, LLC. [Member]
Business Acquisition [Line Items]
Acquisition date			Sep. 19, 2016
Number of stores acquired				1
Davco Development Company and Ricketts, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Sep. 18, 2016
Number of stores acquired				2
Clark Tire & Auto, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Sep. 11, 2016
Number of stores acquired				26
Number of retread centers acquired | property				1
Number of wholesale centers acquired | property				4
NTI, LLC. [Member]
Business Acquisition [Line Items]
Acquisition date			Jul. 18, 2016
Number of stores acquired				1
Kwik-Fit Tire & Service [Member]
Business Acquisition [Line Items]
Acquisition date			Jul. 17, 2016
Number of stores acquired				1
Task Holdings, Inc. and Autopar, Inc. Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date			Jul. 10, 2016
Number of stores acquired				4
Harlow Tire Company Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 26, 2016
Number of stores acquired				1
Express Tire Centers, LLC. Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 19, 2016
Number of stores acquired				2
Pioneer Tire Pros Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date			May 08, 2016
Number of stores acquired				1
McGee Tire Stores, Inc. Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date			May 01, 2016
Number of stores acquired				29
Number of retread centers acquired | property				1
Fiscal 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred | $			$ 14,033
Fiscal 2017 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred | $				$ 129,096