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Other Items (Tables)
 6 Months Ended
Mar. 31, 2025
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
March 31, 2025September 30, 2024
(in thousands)
Cash and cash equivalents$108,059 $183,123 
Restricted cash47,879 52,640 
Cash, cash equivalents, and restricted cash$155,938 $235,763 
Schedule of Restrictions on Cash and Cash Equivalents
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
March 31, 2025September 30, 2024
(in thousands)
Cash and cash equivalents$108,059 $183,123 
Restricted cash47,879 52,640 
Cash, cash equivalents, and restricted cash$155,938 $235,763 
Schedule of Supplementary Cash Flow Information
Table 10.2: Supplemental Disclosures of Cash Flow Information
For the Six Months Ended
March 31, 2025March 31, 2024
(in thousands)
Interest payments$38,767 $39,946 
Income tax payments$70,397 $43,794 
Schedule of Details of Accounts Receivable
Table 10.3: Details of Accounts Receivable, Net
March 31, 2025September 30, 2024
(in thousands)
Billed and billable receivables$738,932 $734,817 
Unbilled receivables368,090 149,488 
Allowance for credit losses(9,618)(4,791)
Accounts receivable, net$1,097,404 $879,514