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Debt - Schedule of debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Debt Instrument [Line Items]    
Rate 2.40% 4.60%
Balance $ 25,000 $ 33,333
Unamortized debt issuance costs (82) (160)
Total indebtedness 24,918 33,173
Less short term portion (6,667) (8,333)
Long-term debt $ 18,251 $ 24,840
London interbank offered rate (LIBOR) | New Term Loan    
Debt Instrument [Line Items]    
Interest rate, spread on variable rate 2.25%