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Acquisitions (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Cash paid for acquisition, net of cash acquired |  |  |  | $ 25,227 | $ 152,110
Revenue |  | $ 455,675 | $ 436,456 | 1,318,850 | 1,266,329
Operating income (loss) |  | 67,431 | 51,160 | 164,702 | 142,731
Atypon Systems Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash paid for acquisition, net of cash acquired | $ 121,000 |  |  |  |
Revenue |  | 8,300 | 8,000 | 24,600 | 10,400
Operating income (loss) |  | $ (800) | $ (1,500) | $ (1,800) | $ (2,000)

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