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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Lessee, Lease, Description [Line Items]      
Cash paid for amounts included in operating lease liabilities $ 4,319 $ 4,771  
Payments of the principal portion of finance lease liabilities 42 34 $ 0
Non-cash: lease liabilities arising from new operating lease assets obtained 3,349 12,190  
Non-cash: lease liabilities arising from new finance lease assets obtained 137 10  
Non-cash: adjustments to lease assets and liabilities 3,756 3,942  
Total lease liabilities $ 14,346    
Cumulative Effect, Period of Adoption, Adjustment      
Lessee, Lease, Description [Line Items]      
Total lease liabilities   $ 12,200