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Contingencies and Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 29, 2020
Sep. 30, 2020
Operating Leases [Abstract]            
Rent expense $ 4,000 $ 3,200 $ 11,000 $ 9,300    
Lease term 1 year   1 year      
Acquisition Contingent Consideration [Abstract]            
Contingent consideration $ 5,500   $ 5,500     $ 5,500
Contingent consideration transaction final payout         $ 5,900  
Loss on contingent consideration $ 0 $ 0 $ 377 $ 0