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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 27, 2020
Jun. 27, 2020
Leases [Abstract]    
Operating lease cost $ 3,245 $ 10,427
Short-term lease cost 60 176
Variable lease cost 1,148 4,095
Total lease cost $ 4,453 $ 14,698