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Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Apr. 30, 2018
Goodwill [Roll Forward] |  |
Beginning balance | $ 1,019,801 |
Foreign translation adjustment | (33,553) |
Ending balance | 986,248 | $ 1,019,801
Research [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 463,419 |
Foreign translation adjustment | (25,832) |
Ending balance | 437,587 | 463,419
Publishing [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 283,851 |
Foreign translation adjustment | (726) | (11,600)
Ending balance | 283,125 | 283,851
Solutions [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 272,531 |
Foreign translation adjustment | (6,995) | 11,600
Ending balance | $ 265,536 | $ 272,531

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |