Revenues (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 347,699	$ 288,587	$ 689,517	$ 535,646
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenues	178,080	154,505	354,309	291,775
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenues	85,971	70,486	170,430	128,106
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenues	48,173	35,489	94,148	64,053
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenues	28,086	21,565	56,352	40,033
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenues	6,581	5,710	12,370	10,142
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 808	$ 832	$ 1,908	$ 1,537