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Debt - CMI Term Loan (Details) - USD ($)
9 Months Ended
Jun. 24, 2016
Sep. 26, 2020
Dec. 28, 2019
Debt Instrument [Line Items]      
Long-term Debt   $ 35,994,000 $ 58,485,000
CMI Term Loan [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 150,000,000    
Debt Instrument, Interest Payment Period 5 years    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months, Percentage 5.00%    
Long-term Debt, Maturities, Repayments of Principal in Year Two, Percentage 10.00%    
Long-term Debt, Maturities, Repayments of Principal in Year Three, Percentage 20.00%    
Long-term Debt, Maturities, Repayments of Principal in Year Four, Percentage 30.00%    
Long-term Debt, Maturities, Repayments of Principal in Year Five, Percentage 35.00%    
CMI Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 2.00% 2.00%  
CMI Term Loan [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%