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Other Balance Sheet Items (Tables)
 9 Months Ended
Jun. 30, 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
June 30, 2024September 30, 2023
(in thousands)
Cash and cash equivalents$102,794 $65,405 
Restricted cash45,007 56,686 
Cash, cash equivalents, and restricted cash$147,801 $122,091 
Schedule of Restrictions on Cash and Cash Equivalents
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
June 30, 2024September 30, 2023
(in thousands)
Cash and cash equivalents$102,794 $65,405 
Restricted cash45,007 56,686 
Cash, cash equivalents, and restricted cash$147,801 $122,091 
Schedule of Supplementary Cash Flow Information
Table 10.2: Supplemental Disclosures of Cash Flow Information
For the Nine Months Ended
June 30, 2024June 30, 2023
(in thousands)
Interest payments$59,367 $59,580 
Income tax payments$67,822 $60,460 
Schedule of Details of Accounts Receivable
Table 10.3: Details of Accounts Receivable, Net
June 30, 2024September 30, 2023
(in thousands)
Billed and billable receivables$613,429 $692,707 
Unbilled receivables249,813 137,885 
Allowance for credit losses(12,780)(3,719)
Accounts receivable, net$850,462 $826,873