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Debt (Details) - USD ($)
3 Months Ended
Jun. 25, 2020
Dec. 31, 2019
Sep. 30, 2020
Jun. 24, 2020
Dec. 30, 2019
Debt Instrument [Line Items]          
Credit limit on revolving loan facility   $ 25,000,000.0 $ 25,000,000.0   $ 23,000,000.0
Commitment fee percentage on line of credit     0.25%    
All Debt          
Debt Instrument [Line Items]          
Increase in debt     $ (4,000,000.0)    
Loan and Security Agreement          
Debt Instrument [Line Items]          
Face value of term loan       $ 5,000,000.0  
Amended and Restated Loan And Security Agreement, Term Loan | London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
Variable interest rate 3.50%        
Amended and Restated Loan And Security Agreement, Term Loan | London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
Variable interest rate 2.25%        
Amended and Restated Loan And Security Agreement, Foreign Bank Term Loan          
Debt Instrument [Line Items]          
Face value of term loan $ 15,000,000.0        
Line of Credit | Loan and Security Agreement          
Debt Instrument [Line Items]          
Percent of qualified AR   80.00%      
Percent of the lower of Cost or Market of US Inventory values   50.00%      
Line of Credit | Amended and Restated Loan And Security Agreement, Term Loan          
Debt Instrument [Line Items]          
Percent of qualified AR 80.00%        
Percent of Net Orderly Liquidation Value (NOLV) 85.00%        
Percent of US real estate values 62.50%        
Credit limit on revolving loan facility   $ 25,000,000      
Term Loan          
Debt Instrument [Line Items]          
Credit limit for external borrowing   5,000,000.0     $ 2,500,000
Face value of term loan   $ 10,000,000.0      
Term of loan   5 years      
Fixed interest rate   4.00%