Sales and Receivable Concentration - Receivables from Largest Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 27, 2021	Jun. 28, 2020
Receivables from largest customers
Receivables	$ 69,902	$ 41,955
Fiat Chrysler Automobiles | Customer Concentration Risk
Receivables from largest customers
Receivables	$ 11,938	$ 5,881
Fiat Chrysler Automobiles | Customer Concentration Risk | Accounts Receivable
Receivables from largest customers
Percentage of Gross Receivables	17.00%	14.00%
General Motors Company | Customer Concentration Risk
Receivables from largest customers
Receivables	$ 22,934	$ 12,630
General Motors Company | Customer Concentration Risk | Accounts Receivable
Receivables from largest customers
Percentage of Gross Receivables	32.00%	30.00%
Ford Motor Company | Customer Concentration Risk
Receivables from largest customers
Receivables	$ 8,204	$ 6,101
Ford Motor Company | Customer Concentration Risk | Accounts Receivable
Receivables from largest customers
Percentage of Gross Receivables	12.00%	15.00%
Total of Major Customers | Customer Concentration Risk
Receivables from largest customers
Receivables	$ 43,076	$ 24,612
Total of Major Customers | Customer Concentration Risk | Accounts Receivable
Receivables from largest customers
Percentage of Gross Receivables	61.00%	59.00%