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Acquisitions (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 0 | $ 125,924 | $ 0
Goodwill |  | $ 1,019,801 |  |  |  | $ 982,101 |  |  |  | 1,019,801 | 982,101 |
Revenue |  | 477,300 | $ 455,700 | $ 451,700 | $ 411,400 | 452,200 | $ 436,400 | $ 425,600 | $ 404,300 | 1,796,103 | 1,718,530 | 1,727,037
Operating income (loss) |  | $ 74,800 | $ 67,400 | $ 82,800 | 14,500 | $ 63,500 | $ 51,200 | $ 47,700 | $ 43,800 | 239,535 | 206,153 | $ 188,113
Atypon Systems Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash, net of cash acquired | $ 121,000 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 48,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 70,000 |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  | $ 70,000 |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 32,900 | 19,100 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 2,700 | $ 3,500 |

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