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Other Balance Sheet Items (Tables)
 6 Months Ended
Mar. 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
March 31, 2024September 30, 2023
(in thousands)
Cash and cash equivalents$77,370 $65,405 
Restricted cash40,970 56,686 
Cash, cash equivalents, and restricted cash$118,340 $122,091 
Schedule of Restrictions on Cash and Cash Equivalents
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
March 31, 2024September 30, 2023
(in thousands)
Cash and cash equivalents$77,370 $65,405 
Restricted cash40,970 56,686 
Cash, cash equivalents, and restricted cash$118,340 $122,091 
Schedule of Supplementary Cash Flow Information
Table 10.2: Supplemental Disclosures of Cash Flow Information
For the Six Months Ended
March 31, 2024March 31, 2023
(in thousands)
Interest payments$39,946 $19,262 
Income tax payments$43,794 $31,926 
Schedule of Details of Accounts Receivable
Table 10.3: Details of Accounts Receivable, Net
March 31, 2024September 30, 2023
(in thousands)
Billed and billable receivables$776,877 $692,707 
Unbilled receivables150,956 137,885 
Allowance for credit losses(11,829)(3,719)
Accounts receivable, net$916,004 $826,873