Sales and Receivable Concentration - Sales to Largest Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jun. 28, 2020	Jun. 30, 2019
Sales to largest customers
Net Sales	$ 42,117	$ 116,938	$ 106,283	$ 119,962	$ 128,704	$ 128,230	$ 112,913	$ 117,159	$ 385,300	$ 487,006
Customer Concentration Risk
Sales to largest customers
Net Sales									$ 240,163	$ 291,356
Customer Concentration Risk | Sales Revenue Net
Sales to largest customers
Percentage of Net Sales									62.00%	60.00%
Fiat Chrysler Automobiles | Customer Concentration Risk
Sales to largest customers
Net Sales									$ 85,010	$ 115,304
Fiat Chrysler Automobiles | Customer Concentration Risk | Sales Revenue Net
Sales to largest customers
Percentage of Net Sales									22.00%	24.00%
General Motors Company | Customer Concentration Risk
Sales to largest customers
Net Sales									$ 102,487	$ 112,719
General Motors Company | Customer Concentration Risk | Sales Revenue Net
Sales to largest customers
Percentage of Net Sales									27.00%	23.00%
Ford Motor Company | Customer Concentration Risk
Sales to largest customers
Net Sales									$ 52,666	$ 63,333
Ford Motor Company | Customer Concentration Risk | Sales Revenue Net
Sales to largest customers
Percentage of Net Sales									13.00%	13.00%