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Long-Term Debt - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 26, 2021
Sep. 30, 2020
Sep. 30, 2016
Debt Instrument [Line Items]      
Long-term debt, balance   $ 5,178  
Mortgage Note | Federal Home Loan Board Five Year Classic Advance Rate | Scenario, Forecast      
Debt Instrument [Line Items]      
Basis spread on variable rate 240.00%    
BTU International, Inc. | Mortgage Note      
Debt Instrument [Line Items]      
Long-term debt, balance   $ 5,200  
Maturity date   Sep. 26, 2023  
Interest rate     4.11%