Revenues (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 329,281	$ 310,110	$ 970,458	$ 913,027
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenue	38,261	37,549	131,575	124,677
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,256	7,128	20,317	22,751
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenue	24,987	23,223	77,397	71,894
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenue	179,086	167,984	491,956	459,236
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue	79,889	73,430	246,704	232,062
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 802	$ 796	$ 2,509	$ 2,407