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Other Balance Sheet Items (Tables)
 3 Months Ended
Dec. 31, 2023
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
Table 9.1: Details of Cash and Cash Equivalents and Restricted Cash
December 31, 2023September 30, 2023
(in thousands)
Cash and cash equivalents$104,186 $65,405 
Restricted cash49,309 56,686 
Cash, cash equivalents, and restricted cash$153,495 $122,091 
Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets.
Restrictions on Cash and Cash Equivalents
Table 9.1: Details of Cash and Cash Equivalents and Restricted Cash
December 31, 2023September 30, 2023
(in thousands)
Cash and cash equivalents$104,186 $65,405 
Restricted cash49,309 56,686 
Cash, cash equivalents, and restricted cash$153,495 $122,091 
Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets.
Supplementary Cash Flow Information
Table 9.2: Supplemental Disclosures of Cash Flow Information
For the Three Months Ended
December 31, 2023December 31, 2022
(in thousands)
Interest payments$20,522 $19,748 
Income tax (refunds)/payments, net$(588)$4,982 
Details of Accounts Receivable
Table 9.3: Details of Accounts Receivable, Net
December 31, 2023September 30, 2023
(in thousands)
Billed and billable receivables$708,145 $692,707 
Unbilled receivables160,250 137,885 
Allowance for credit losses(7,986)(3,719)
Accounts receivable, net$860,409 $826,873