Revenues (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 26, 2020	Dec. 28, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 284,591	$ 329,281	$ 820,237	$ 970,458
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenues	29,962	38,261	94,015	131,575
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,391	6,256	15,533	20,317
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenues	20,464	24,987	60,497	77,397
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenues	162,442	179,086	454,217	491,956
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenues	65,648	79,889	193,754	246,704
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 684	$ 802	$ 2,221	$ 2,509