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Commitments And Contingencies (Narrative) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Sep. 29, 2018
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Purchase Commitment, Excluding Long-term Commitment [Line Items]          
Operating Leases Rent Expense Net     $ 7,100,000 $ 7,800,000 $ 6,600,000
Standard and Extended Product Warranty Accrual   $ 20,000 20,000 32,000  
Loss Contingency, Damages Awarded, Value $ 6,700,000   6,700,000    
Loss on settlement of arbitration   4,500,000 $ 4,535,000 $ 0 $ 0
Loss Contingency, Loss in Period, Net of Tax   $ 3,400,000      
Maximum          
Purchase Commitment, Excluding Long-term Commitment [Line Items]          
Terms of lease agreements     10 years    
Inventories [Member]          
Purchase Commitment, Excluding Long-term Commitment [Line Items]          
Loss Contingency, Damages Sought, Value     $ 9,300,000    
Accounts Receivable [Member]          
Purchase Commitment, Excluding Long-term Commitment [Line Items]          
Loss Contingency, Damages Sought, Value     $ 1,900,000