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Revenues (Schedule Of Disaggregated Revenue By Product Group) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 324,113	$ 307,105	$ 641,177	$ 602,916
Brakes [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,201	44,380	93,314	87,128
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,431	8,264	14,061	15,623
Steering [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,847	23,873	52,410	48,671
Tires [Member]
Disaggregation of Revenue [Line Items]
Revenue	159,142	150,522	312,870	291,252
Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue	84,649	79,271	166,815	158,632
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 843	$ 795	$ 1,707	$ 1,610

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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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