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Revenue Recognition - Balance Sheet Impact of Adoption of ASC 606 (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Accounts Receivable, Net, Current | $ 629,597 | $ 694,221
ASSETS |  |
Contract assets | 157,918 | 142,882
Deferred tax assets | 30,581 | 8,607
LIABILITIES AND EQUITY |  |
Contract liabilities | 154,609 | 143,270
Income taxes payable | 1,877 | 8,272
Equity: |  |
Retained earnings | 1,026,836 | $ 944,965
Recognition Under Previous Guidance |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Accounts Receivable, Net, Current | 634,972 |
ASSETS |  |
Contract assets | 165,530 |
Deferred tax assets | 29,461 |
LIABILITIES AND EQUITY |  |
Contract liabilities | 164,868 |
Income taxes payable | 1,597 |
Equity: |  |
Retained earnings | 1,028,724 |
Impact of the Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Accounts Receivable, Net, Current | (5,375) |
ASSETS |  |
Contract assets | (7,612) |
Deferred tax assets | 1,120 |
LIABILITIES AND EQUITY |  |
Contract liabilities | (10,259) |
Income taxes payable | 280 |
Equity: |  |
Retained earnings | $ (1,888) |

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