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Revenue - Summary of Accounts Receivable Billed and Unbilled and Deferred Revenue (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable—billed (net of allowances for doubtful accounts of $23,419 and $36,121 as of September 30, 2020 and 2019, respectively) $ 685,485 $ 760,797
Accounts receivable—unbilled (current) 175,548 227,061
Accounts receivable—unbilled (non-current) 42,089 16,987
Total Accounts receivable—unbilled 217,637 244,048
Deferred revenue (current) (126,841) (118,182)
Deferred revenue (non-current) (16,529) (23,785)
Total Deferred revenue $ (143,370) $ (141,967)