Annual report pursuant to Section 13 and 15(d)

Other Balance Sheet Components - Accounts Receivable, Net (Details)

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Other Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for credit losses $ (3,719) $ (8,273)  
Accounts receivable, net 826,873 807,110  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 8,273 8,044 $ 6,051
Provision for estimated credit losses 7,097 6,799 11,038
Write-offs, net of recoveries (11,651) (6,570) (9,045)
Balance at end of period 3,719 8,273 $ 8,044
Billed and billable receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable Gross 692,707 723,979  
Unbilled receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable Gross $ 137,885 $ 91,404