Income Taxes (Narrative) (Detail) - USD ($)	12 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Income Tax Disclosure [Abstract]
Tax Credit Carryforwards	$ 8,800,000
Toll Tax Liability	800,000
Toll Tax Liability, Change in Amount	400,000
Other Tax Expense (Benefit)	1,300,000
Current Income Tax Expense (Benefit)	1,300,000
Estimated Federal And State Income Taxes And Potential Withholding Taxes	800,000
Effect of repatriation of foreign earnings, net	7,800,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 8,800,000
Remaining Contractual Term Of Tax Credit Expiration Date	20 years
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 347,000
Previously unrecognized tax benefits	$ 2,863,000	$ 4,099,000	$ 4,011,000	$ 3,947,000