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Debt - Schedule of debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 27, 2020
Sep. 28, 2019
Debt Disclosure [Abstract]    
Debt, interest rate 2.40% 4.60%
Debt $ 28,333 $ 33,333
Unamortized debt issuance costs (103) (160)
Total indebtedness 28,230 33,173
Less short-term portion (8,333) (8,333)
Long-term debt $ 19,897 $ 24,840
LIBOR    
Debt Instrument [Line Items]    
Interest rate, spread on variable rate 2.25%