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Summary of Significant Accounting Policies - Summary of Impact of Adoption of ASC 606 on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Account receivable-unbilled | $ 227,061 | $ 274,036 | $ 263,997
Prepaid expenses and other current assets | 216,084 |  | 229,999
Other noncurrent assets | 423,941 |  | 420,369
Deferred revenue (current) | 118,182 | 146,462 | 132,414
Accrued expenses and other current liabilities | 647,657 |  | 706,637
Deferred income taxes and taxes payable | 207,508 |  | 224,572
Retained earnings | $ 5,012,799 |  | $ 4,673,901
Accounting Standards Update 2014-09 [Member] |  |  |
Account receivable-unbilled |  | 274,036 |
Prepaid expenses and other current assets |  | 229,028 |
Other noncurrent assets |  | 436,005 |
Deferred revenue (current) |  | 146,462 |
Accrued expenses and other current liabilities |  | 692,575 |
Deferred income taxes and taxes payable |  | 234,996 |
Retained earnings |  | 4,688,195 |
Accounting Standards Update 2014-09 [Member] | Adjustments due to ASC 606 [Member] |  |  |
Account receivable-unbilled |  | 10,039 |
Prepaid expenses and other current assets |  | (971) |
Other noncurrent assets |  | 15,636 |
Deferred revenue (current) |  | 14,048 |
Accrued expenses and other current liabilities |  | (14,062) |
Deferred income taxes and taxes payable |  | 10,424 |
Retained earnings |  | $ 14,294 |

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