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Other Balance Sheet Items - Details of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ (4,663)	$ (4,791)
Accounts receivable, net	962,650	879,514
Billed and billable receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	672,288	734,817
Unbilled receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 295,025	$ 149,488

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