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Revenue - Summary of Accounts Receivable Billed and Unbilled and Deferred Revenue (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable —billed (net of allowances for doubtful accounts of $20,065 and $23,419 as of September 30, 2021 and 2020, respectively) $ 704,541 $ 685,485
Accounts receivable — unbilled (current) 162,278 175,548
Accounts receivable — unbilled (non-current) 38,252 42,089
Total Accounts receivable — unbilled 200,530 217,637
Deferred revenue (current) (237,374) (126,841)
Deferred revenue (non-current) (108,675) (16,529)
Total Deferred revenue $ (346,049) $ (143,370)