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Acquisitions (Narrative) (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 13, 2019 store	Feb. 07, 2019 entity	Dec. 29, 2018 USD ($)	Dec. 23, 2017 USD ($)	Dec. 29, 2018 USD ($) property store	Dec. 23, 2017 USD ($) store
Business Acquisition [Line Items]
Store acquisitions related to acquisition growth strategy | property					5
Costs related to completed acquisitions | $			$ 100	$ 100	$ 400	$ 400
Sales for acquired entities | $			$ 14,700	$ 4,600	33,400	$ 8,200
Change in estimates, inventories | $					(100)
Change in estimates, property, plant and equipment | $					(200)
Change in estimates, intangible assets | $					(200)
Adjustments to goodwill related to purchase accounting | $					$ 500
Subsequent Event [Member]
Business Acquisition [Line Items]
Number of acquisitions | entity		12
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
R.A. Johnson, Inc. [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Acquisition date	Jan. 13, 2019
Number of stores acquired	13
Colony Tire Corporation [Member]
Business Acquisition [Line Items]
Acquisition date					Dec. 09, 2018
Number of stores acquired					2
Jeff Pohlman Tire & Auto Service, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Nov. 04, 2018
Number of stores acquired					5
Quality Tire and Auto, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Oct. 14, 2018
Number of stores acquired					1
Walton’s Automotive, LLC. [Member]
Business Acquisition [Line Items]
Acquisition date					Sep. 23, 2018
Number of stores acquired					1
C&R Auto Service, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Sep. 16, 2018
Number of stores acquired					1
Steele-Guiltner, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Sep. 09, 2018
Number of stores acquired					4
Mayfair Tire & Service Center, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Jul. 15, 2018
Number of stores acquired					1
Sawyer Tire, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Jul. 08, 2018
Number of stores acquired					8
Free Service Tire Company, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					May 13, 2018
Number of stores acquired					12
Liberty Auto Group, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date					Apr. 01, 2018
Number of stores acquired					4
MLR, Incorporated [Member]
Business Acquisition [Line Items]
Acquisition date					Dec. 17, 2017
Number of stores acquired						1
TriGar Tire & Auto Service Center, LLC. [Member]
Business Acquisition [Line Items]
Acquisition date					Dec. 10, 2017
Number of stores acquired						2
TriGar Tire & Auto Service Center, LLC., Operated By Monro [Member]
Business Acquisition [Line Items]
Number of stores acquired						1
TriGar Tire & Auto Service Center, LLC., Operated By Mr. Tire [Member]
Business Acquisition [Line Items]
Number of stores acquired						1
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
Fiscal 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred | $						$ 15,742
Fiscal 2019 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred | $					$ 45,447

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