Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($)	Jul. 02, 2021	Jul. 03, 2020	Jun. 30, 2019	Jun. 30, 2018
Accumulated other comprehensive income adjustment for foreign currency	$ (739,000)	$ 174,000	$ (232,000)
Accumulated other comprehensive income adjustment for pension plans	$ 3,285,000	$ (1,768,000)	$ (2,350,000)
Accumulated other comprehensive income, available-for-sale securities gains (losses)				$ 0