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Debt - Textual (Details)
12 Months Ended
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Oct. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Outstanding borrowings $ 4,500,000 $ 4,500,000  
Line of credit | New term loan      
Debt Instrument [Line Items]      
Fixed charge ratio, Covenant 2 1.0 1.0  
Fixed charge ratio, Covenant 1 1.15 1.15  
Revolving credit facility | Line of credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity     $ 80,000,000.0
Fixed charge ratio, Covenant 2 1.0 1.0  
Fixed charge ratio, Covenant 1 1.15 1.15  
London interbank offered rate (LIBOR) | New term loan      
Debt Instrument [Line Items]      
Interest rate, spread on variable rate 2.25%    
London interbank offered rate (LIBOR) | Revolving credit facility | Line of credit      
Debt Instrument [Line Items]      
Interest rate, spread on variable rate 2.50%