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Other Balance Sheet Items (Tables)
 3 Months Ended
Dec. 31, 2024
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
December 31, 2024September 30, 2024
(in thousands)
Cash and cash equivalents$72,653 $183,123 
Restricted cash50,217 52,640 
Cash, cash equivalents, and restricted cash$122,870 $235,763 
Schedule of Restrictions on Cash and Cash Equivalents
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
December 31, 2024September 30, 2024
(in thousands)
Cash and cash equivalents$72,653 $183,123 
Restricted cash50,217 52,640 
Cash, cash equivalents, and restricted cash$122,870 $235,763 
Schedule of Supplementary Cash Flow Information
Table 10.2: Supplemental Disclosures of Cash Flow Information
For the Three Months Ended
December 31, 2024December 31, 2023
(in thousands)
Interest payments$17,559 $20,522 
Income tax payments/(refunds), net$12,418 $(588)
Schedule of Details of Accounts Receivable
Table 10.3: Details of Accounts Receivable, Net
December 31, 2024September 30, 2024
(in thousands)
Billed and billable receivables$672,288 $734,817 
Unbilled receivables295,025 149,488 
Allowance for credit losses(4,663)(4,791)
Accounts receivable, net$962,650 $879,514