Revenue from Contracts with Customers - Revenue by Customer or Customer Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 28, 2021	Mar. 29, 2020
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 121,644	$ 116,938	$ 375,238	$ 343,183
General Motors Company
Entity Wide Revenue Major Customer [Line Items]
Revenue	34,543	31,656	111,322	90,899
Fiat Chrysler Automobiles
Entity Wide Revenue Major Customer [Line Items]
Revenue	21,685	26,050	69,919	78,686
Ford Motor Company
Entity Wide Revenue Major Customer [Line Items]
Revenue	21,722	15,462	54,356	46,527
Commercial and Other OEM Customers
Entity Wide Revenue Major Customer [Line Items]
Revenue	17,241	20,184	58,272	62,950
Tier 1 Customers
Entity Wide Revenue Major Customer [Line Items]
Revenue	17,289	17,495	53,444	50,026
Hyundai / Kia
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 9,164	$ 6,091	$ 27,925	$ 14,095