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Leases - Components of Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 28, 2020
Mar. 31, 2021
Mar. 28, 2020
Lease Cost        
Operating lease cost $ 9,565 $ 10,386 $ 18,956 $ 19,143
Short-term lease cost 610 1,017 1,158 2,890
Variable lease cost 2,476 575 4,863 2,490
Sublease income (1,131) (1,013) (2,215) (2,025)
Total lease cost $ 11,520 $ 10,965 $ 22,762 $ 22,498