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Supporting Financial Information - Accounts Receivable (Details) - USD ($)
Jun. 30, 2022
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Billed receivables $ 41,870,000 $ 26,140,000
Contract assets 8,467,000 7,307,000
Total accounts receivable 50,337,000 33,447,000
Less: Allowance for doubtful accounts 0 0
Accounts receivable, net $ 50,337,000 $ 33,447,000