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Summary of Significant Accounting Policies (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 3,778 $ 968
Additions 2,803 2,534
Uncollectible accounts charged to allowance, net of recoveries   276
Uncollectible accounts charged to allowance, net of recoveries (2,647)  
Balance at end of period $ 3,934 $ 3,778