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Commitments and Contingencies (Summary of Operating Lease Activities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 24, 2019
Sep. 25, 2018
Commitments and Contingencies Disclosure [Abstract]    
Minimum rentals $ 6,671 $ 5,972
Less sublease rentals (239) (404)
Net rent expense paid $ 6,432 $ 5,568