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Derivatives - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Jan. 02, 2016
Forward Currency-Exchange Contracts [Abstract]            
Recognized gains (losses) $ (14,000) $ (67,000) $ (46,000) $ (40,000)    
Interest rate swap agreements            
Interest Rate Swaps [Abstract]            
Effective portion of cash flow hedge, percentage         100.00%  
Cash Flow Hedging | Designated as Hedging Instrument | 2015 Swap Agreement            
Interest Rate Swaps [Abstract]            
Derivative, notional amount           $ 10,000,000
Fixed rate of interest (in hundredths)           1.50%
Cash Flow Hedging | Designated as Hedging Instrument | 2018 Swap Agreement            
Interest Rate Swaps [Abstract]            
Derivative, notional amount         $ 15,000,000  
Fixed rate of interest (in hundredths)         3.15%  
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | 2018 Swap Agreement            
Interest Rate Swaps [Abstract]            
Interest rate floor         0.00%