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Organization and Basis of Presentation - Results had former accounting policies been utilized (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable — unbilled | $ 94,102 | $ 66,950 | $ 31,536
Deferred income taxes | 617 | 209 | 6,834
Deferred revenue | 40,951 | 39,415 | 51,182
Deferred income taxes | 44,769 | 33,451 | 26,377
Accumulated other comprehensive loss | (41,110) |  | (36,953)
Retained earnings | 752,370 | 666,210 | $ 633,281
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable — unbilled | 37,761 | 35,414 |
Deferred income taxes | (6,582) | (6,625) |
Deferred revenue | (12,081) | (11,767) |
Deferred income taxes | 7,574 | 7,074 |
Accumulated other comprehensive loss | (998) |  |
Retained earnings | 35,483 | $ 32,929 |
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable — unbilled | 56,341 |  |
Deferred income taxes | 7,199 |  |
Deferred revenue | 53,032 |  |
Deferred income taxes | 37,195 |  |
Accumulated other comprehensive loss | (40,112) |  |
Retained earnings | $ 716,887 |  |

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