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Long-Term Debt (Narrative) (Detail) - USD ($)
12 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Nov. 24, 2020
Dec. 28, 2016
Debt Disclosure [Line Items]        
Revolving loan $ 90,900,000 $ 60,100,000    
Letters of Credit Outstanding, Amount 300,000 400,000    
Additional availability of line of credit 2,100,000 4,500,000    
Long-term Debt 100,411,000      
Debt Instrument, Periodic Payment, Principal 94,000      
2022 2,143,000      
2023 2,190,000      
2024 2,239,000      
2025 2,290,000      
2026 92,074,000      
Total debt 100,936,000      
Unamortized debt issuance costs (525,000)      
Long-term Debt        
Debt Disclosure [Line Items]        
Long-term Debt 4,200,000 10,000,000    
Equipment Term Loan        
Debt Disclosure [Line Items]        
Long-term Debt 4,200,000 $ 900,000   $ 5
Equipment Term Loan Juarez        
Debt Disclosure [Line Items]        
Long-term Debt 5,800,000   $ 6,000,000  
Debt Instrument, Periodic Payment, Principal 100,000      
Wells Fargo Bank        
Debt Disclosure [Line Items]        
Increase in revolving line of credit $ 93,000,000      
Maximum        
Debt Disclosure [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 5.52% 2.18%    
Minimum        
Debt Disclosure [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.25% 2.17%    
Fixed Rate [Member] | Debt Instrument, Basis Spread on Variable Rate, Scenario Two [Member] | Line of Credit | Line of Credit        
Debt Disclosure [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   2.50%