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Revenue (Tables) | 12 Months Ended
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Sep. 30, 2019
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, 2018 |  |  | October 1, 2018 (as adjusted) |  |  | September 30, 2019 |
Accounts receivable — billed (net of allowances for doubtful accounts of $21,211 as of September 30 and October 1, 2018 and $36,121 as of September 30, 2019) |  | $ | 707,505 |  |  | $ | 707,505 |  |  | $ | 760,797 |
Accounts receivable — unbilled (current) |  | $ | 263,997 |  |  | $ | 274,036 |  |  | $ | 227,061 |
Accounts receivable — unbilled (non-current) |  | $ | 15,686 |  |  | $ | 13,185 |  |  | $ | 16,987 |
Total Accounts receivable — unbilled |  | $ | 279,683 |  |  | $ | 287,221 |  |  | $ | 244,048 |
Deferred revenue (current) |  | $ | (132,414 | ) |  | $ | (146,462 | ) |  | $ | (118,182 | )
Deferred revenue (non-current) |  | $ | (27,977 | ) |  | $ | (27,977 | ) |  | $ | (23,785 | )
Total Deferred revenue |  | $ | (160,391 | ) |  | $ | (174,439 | ) |  | $ | (141,967 | )

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