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Contract Balance - Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]    
Billed $ 301,667 $ 264,942
Unbilled 234,462 210,795
Receivables Gross 536,129 475,737
Less: allowance for doubtful accounts (7,506) (6,454)
Accounts Receivable, after Allowance for Credit Loss 528,623 469,283
Less: long-term receivables (36,081) (42,641)
Accounts receivable, net $ 492,542 $ 426,642