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Long-Term Debt (Narrative) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jun. 29, 2019
Jun. 29, 2019
Jun. 30, 2018
Dec. 28, 2016
Aug. 06, 2015
Sep. 03, 2014
Debt Disclosure [Line Items]            
Long-term Debt $ 36,288,000 $ 36,288,000       $ 35,000,000.0
Debt Instrument, Periodic Payment, Principal   1,250,000        
Revolving loan 23,356,000 23,356,000 $ 16,222,000      
Letters of Credit Outstanding, Amount 400,000 400,000 400,000      
Additional availability of line of credit 21,300,000 21,300,000 28,400,000      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 5,871,000 5,871,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two 5,871,000 5,871,000        
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,250,000 1,250,000        
Long-term Debt, Maturities, Repayments of Principal in Year Four 0 0        
Long-term Debt, Maturities, Repayments of Principal in Year Five 23,356,000 23,356,000        
Total debt 36,348,000 36,348,000        
Unamortized Debt Issuance Expense (60,000) (60,000)        
Long-term Debt            
Debt Disclosure [Line Items]            
Long-term Debt 11,300,000 11,300,000 16,300,000      
Equipment Term Loan            
Debt Disclosure [Line Items]            
Long-term Debt $ 1,700,000 1,700,000 $ 2,600,000 $ 3,900,000    
Debt Instrument, Periodic Payment, Principal   $ 200,000        
Wells Fargo Bank            
Debt Disclosure [Line Items]            
Increase in revolving line of credit         $ 45,000,000.0  
Maximum            
Debt Disclosure [Line Items]            
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 5.50% 5.50% 5.00%      
Minimum            
Debt Disclosure [Line Items]            
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 4.40% 4.40% 4.09%      
One-Month London Interbank Offered Rate [Member] | Line of Credit            
Debt Disclosure [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.50%          
Federal Funds Rate [Member] | Line of Credit            
Debt Disclosure [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.50%          
Fixed Rate [Member] | Debt Instrument, Basis Spread on Variable Rate, Scenario One [Member] | Line of Credit            
Debt Disclosure [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.75%          
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     2.00%      
Fixed Rate [Member] | Debt Instrument, Basis Spread on Variable Rate, Scenario Three [Member] | Line of Credit | Line of Credit            
Debt Disclosure [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.25%