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Revenues (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 288,587	$ 324,113	$ 535,646	$ 641,177
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenues	35,489	46,538	64,053	93,314
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,710	7,108	10,142	14,061
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenues	21,565	26,178	40,033	52,410
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenues	154,505	158,805	291,775	312,870
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenues	70,486	84,641	128,106	166,815
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 832	$ 843	$ 1,537	$ 1,707

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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