Revenue (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,256,524	$ 1,200,230	$ 1,127,815
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenue	169,138	162,709	146,082
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,058	28,713	26,969
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenue	100,230	95,711	94,391
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenue	634,513	601,295	560,398
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue	324,494	308,668	296,658
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 3,091	$ 3,134	$ 3,317