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Revenue (Tables) | 12 Months Ended
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Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |
Summary of Accounts Receivable and Deferred Revenue | The following table provides information a b out Accounts receivable, both billed and unbilled and deferred revenue:
|  | As of |
|  | September 30, 2020 |  |  | September 30, 2019 |
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 | )

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