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Acquisitions (Details) $ in Thousands, Article in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) Employee Journal Article WebSite SocietyandPublisher | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid for acquisition, net of cash acquired |  |  |  | $ 6,097 | $ 135,753 |  |  |
Revenue |  | $ 451,731 | $ 425,588 | 863,175 | 829,873 |  |  |
Goodwill |  | 999,546 | 974,068 | 999,546 | 974,068 |  | $ 982,101 | $ 951,663
Operating income (loss) |  | 82,771 | $ 47,644 | 97,271 | $ 91,571 |  |  |
Atypon Systems Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid for acquisition, net of cash acquired | $ 121,000 |  |  |  |  |  |  |
Number of employees | Employee | 260 |  |  |  |  |  |  |
Revenue |  | 8,000 |  | $ 16,300 |  |  |  |
Goodwill | $ 70,000 |  |  |  |  |  |  |
Working capital | 3,000 |  |  |  |  |  |  |
Estimated useful life of intangible assets acquired |  |  |  | 12 years |  |  |  |
Operating income (loss) |  | $ (600) |  | $ (1,100) |  |  |  |
Atypon Systems Inc [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | $ 31,000 |  |
Atypon Systems Inc [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 14,000 |  |  |  |  |  |  |
Atypon Systems Inc [Member] | Software [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 28,000 |  |  |  |  |  |  |
Atypon Systems Inc [Member] | Trademarks [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 6,000 |  |  |  |  |  |  |
Atypon Systems Inc [Member] | Literatum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of journals hosted | Journal | 9,000 |  |  |  |  |  |  |
Number of journal articles hosted | Article | 13 |  |  |  |  |  |  |
Atypon Systems Inc [Member] | Literatum [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of publication web sites hosted | WebSite | 1,800 |  |  |  |  |  |  |
Number of societies and publishers hosted | SocietyandPublisher | 1,500 |  |  |  |  |  |  |

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