Revenue by Customer or Customer Group (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 29, 2019	Sep. 30, 2018
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 119,962	$ 117,159
Fiat Chrysler Automobiles
Entity Wide Revenue Major Customer [Line Items]
Revenue	25,482	30,297
General Motors Company
Entity Wide Revenue Major Customer [Line Items]
Revenue	33,838	25,287
Ford Motor Company
Entity Wide Revenue Major Customer [Line Items]
Revenue	15,812	15,523
Tier 1 Customers
Entity Wide Revenue Major Customer [Line Items]
Revenue	17,747	17,816
Commercial and Other OEM Customers
Entity Wide Revenue Major Customer [Line Items]
Revenue	21,346	20,928
Hyundai / Kia
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 5,737	$ 7,308

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.

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration