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Revenue (Tables) | 12 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Summary of Accounts Receivable and Deferred Revenue | The following table provides information about Accounts receivable, both billed and unbilled and deferred revenue:
|  | As of |
|  | September 30, 2021 |  |  | September 30, 2020 |
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 | )

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