Revenues (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 26, 2021	Jun. 27, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 341,818	$ 247,059
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenues	176,229	137,270
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenues	84,459	57,620
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenues	45,975	28,564
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenues	28,266	18,468
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,789	4,432
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 1,100	$ 705