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Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 01, 2018 | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018 | Oct. 31, 2018 | Apr. 30, 2018
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net cash payment for acquisition |  |  |  |  |  | $ 190,467 |  | $ 0 |  |  |
Goodwill |  | $ 1,103,222 |  |  |  | 1,103,222 |  |  |  |  | $ 1,019,801
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired |  | 671,441 |  |  |  | 671,441 |  |  |  |  | 615,244
Revenue |  | 449,367 |  | $ 455,675 |  | 1,308,890 |  | 1,318,850 |  |  |
Operating loss |  | 50,346 |  | $ 65,394 | [1] | 143,961 |  | $ 158,752 | [1] |  |
Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 374,808 |  |  |  | 374,808 |  |  |  |  | 272,531
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired |  | 251,855 | [2] |  |  | 251,855 | [2] |  |  |  | $ 161,729
The Learning House, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest acquired |  |  |  |  |  |  |  |  |  | 100.00% |
Consideration transferred | $ 201,300 |  |  |  |  |  |  |  |  |  |
Payment to acquire business, gross | 200,800 |  |  |  |  |  |  |  |  |  |
Cash acquired | 10,300 |  |  |  |  |  |  |  |  |  |
Net cash payment for acquisition | 190,500 |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired |  | 109,500 |  |  |  | 109,500 |  |  |  |  |
The Learning House, Inc. [Member] | Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 109,100 |
Net liabilities assumed |  |  |  |  |  |  |  |  |  | (17,300) |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  |  |  | 0 |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired |  |  |  |  |  |  |  |  |  | $ 109,500 |
Revenue |  | 13,400 |  |  |  | 13,400 |  |  |  |  |
Operating loss |  | (5,200) |  |  |  | (5,200) |  |  |  |  |
The Learning House, Inc. [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Issuance of warrants | $ 500 |  |  |  |  |  |  |  |  |  |
The Learning House, Inc. [Member] | Warrants [Member] | Common Stock Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock warrantholders are allowed to purchase (in shares) |  |  |  |  |  |  |  |  |  | 400,000 |
Exercise price per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 90.00 |
The Learning House, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired |  | 103,800 |  |  |  | $ 103,800 |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 15 years |  |  |  |  |
The Learning House, Inc. [Member] | Course Content [Member] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired |  | $ 5,700 |  |  |  | $ 5,700 |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 4 years |  |  |  |  |
[1] | Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $6.0 million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other for the three and nine months ended January 31, 2018, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended January 31, 2018 was $1.0 million in Research, $0.6 million in Publishing, and $0.4 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the nine months ended January 31, 2018 was $3.1 million in Research, $1.7 million in Publishing, and $1.2 million in Corporate expenses.
[2] | As of January 31, 2019, amounts include intangible assets acquired as part of the acquisition of Learning House on November 1, 2018. Refer to Note 3, "Acquisition," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information related to the acquisition of Learning House.

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