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Debt - Additional Information (Details)
$ in Thousands
Dec. 29, 2018
USD ($)
Sep. 29, 2018
USD ($)
Debt Instrument [Line Items]    
Fixed charge ratio, covenant one 1  
Fixed charge ratio, covenant two 1.15  
Outstanding debt $ 39,782 $ 39,764
Letter of credit    
Debt Instrument [Line Items]    
Unused borrowing capacity $ 4,500 $ 4,500