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Income Taxes (Narrative) (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Jun. 27, 2015
Income Tax Disclosure [Abstract]          
Tax Credit Carryforwards $ 8,700,000 $ 8,700,000      
Tax Credit Carryforwards, R&D 8,000,000 $ 8,000,000      
Accumulated unremitted earnings tax rate for cash repatriation   15.50%      
Accumulated unremitted earnings tax rate for non liquid asset   8.00%      
Provisional Toll Tax Liability 400,000 $ 1,200,000      
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   1,300,000      
Tax Benefit from Territorial Tax Conversion   1,300,000      
Estimated Federal And State Income Taxes And Potential Withholding Taxes 800,000 800,000      
Effect of repatriation of foreign earnings, net   $ 14,300,000      
Remaining Contractual Term Of Tax Credit Expiration Date   20 years      
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 726,000 $ 726,000      
Unrecognized Tax Benefits $ 4,011,000 $ 4,011,000 $ 3,947,000 $ 3,760,000 $ 3,446,000