Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Schedule of Non-cancellable Operating Leases Minimum Payments (Details) (Parenthetical)

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Commitments and Contingencies - Schedule of Non-cancellable Operating Leases Minimum Payments (Details) (Parenthetical) - USD ($)
$ in Thousands
6 Months Ended
Mar. 28, 2021
Sep. 27, 2020
Commitments and Contingencies Disclosure [Abstract]    
Borrowing discount rate 5.00%  
Lease options exercised description Assumes a discount borrowing rate of 5.0% on the new lease amendments effective as of January 11, 2021 and 7.5% on the remaining lease term for the Applied Optics Dallas facility through October 31, 2021.  
Short-term operating lease $ 477 $ 417
Long-term operating lease 3,374 $ 1,037
Rent $ 11  
Lease term expiring Oct. 31, 2021