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Acquisitions (Details) shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 29, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Jan. 31, 2022 USD ($) Business | Jul. 31, 2021 Business | Jan. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) | Jan. 31, 2021 USD ($) | Apr. 30, 2021 USD ($) | [1]
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  | $ 515,884 |  | $ 482,912 | $ 1,537,275 | $ 1,405,249 |
Operating income (loss) |  |  | 45,989 |  | $ 34,327 | 160,845 | 134,271 |
Assets [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | 1,325,964 |  |  | 1,325,964 |  | $ 1,304,340
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired |  |  |  |  |  | 70,620 | $ 298,590 |
Research Publishing & Platforms [Member] |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | 628,012 |  |  | 628,012 |  | 619,203
Education Services [Member] |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | 193,683 |  |  | 193,683 |  | $ 172,625
XYZ Media [Member] |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Total cash consideration transferred | $ 38,000 |  |  |  |  |  |  |
Acquisition related costs |  |  | 100 |  |  | $ 100 |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |
Fair value of consideration transferred | 45,400 |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Intangible assets, net | 23,300 |  |  |  |  |  |  |
Goodwill | $ 21,600 |  |  |  |  |  |  |
XYZ Media [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 1 year |  |
XYZ Media [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 7 years |  |
XYZ Media [Member] | Class A [Member] |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Issuance of common shares in consideration transferred (in shares) | shares | 129 |  |  |  |  |  |  |
Issuance of common shares in consideration transferred | $ 7,400 |  |  |  |  |  |  |
XYZ Media [Member] | Education Services [Member] |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  | 1,000 |  |  | $ 1,000 |  |
Operating income (loss) |  |  | (300) |  |  | (300) |  |
Hindawi [Member] |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Total cash consideration transferred |  | $ 299,300 |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |
Fair value of consideration transferred |  | $ 300,100 |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 194,900 |  |  | 194,900 |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Percentage of ownership interest acquired |  | 100.00% |  |  |  |  |  |
Settlement of preexisting relationship |  | $ 800 |  |  |  |  |  |
Cash acquired |  | 1,000 |  |  |  |  |  |
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired |  | $ 298,300 |  |  |  |  |  |
Hindawi [Member] | Research Publishing & Platforms [Member] |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  | 15,200 |  |  | 39,800 |  |
Operating income (loss) |  |  | 3,500 |  |  | 8,600 |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | 147,400 |  |  | 147,400 |  |
Other Acquisitions [Member] |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |
Total cash consideration transferred |  |  |  |  |  | 33,700 |  |
Acquisition related costs |  |  |  |  |  | 400 |  |
Revenue |  |  | 2,800 |  |  | 3,500 |  |
Cash to be paid after acquisition date |  |  |  |  |  | 4,600 |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |
Fair value of consideration transferred |  |  |  |  |  | 38,300 |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 13,600 |  |  | 13,600 |  |
Goodwill |  |  | 21,300 |  |  | 21,300 |  |
Goodwill - tax deductible |  |  | 17,800 |  |  | 17,800 |  |
Goodwill - not tax deductible |  |  | $ 3,500 |  |  | 3,500 |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Cash acquired |  |  |  |  |  | 1,200 |  |
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired |  |  |  |  |  | $ 32,500 |  |
Other Acquisitions [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 5 years |  |
Other Acquisitions [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 9 years |  |
Other Acquisitions [Member] | Trademarks [Member] |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 2 years |  |
Other Acquisitions [Member] | Covenants Not to Compete [Member] |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  |  | 4 years |  |
Other Acquisitions [Member] | Research Publishing & Platforms [Member] |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |
Number of immaterial businesses acquired | Business |  |  | 1 |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 21,300 |  |  | $ 21,300 |  |
Other Acquisitions [Member] | Education Services [Member] |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |
Number of immaterial businesses acquired | Business |  |  |  | 1 |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 0 |  |  | $ 0 |  |
[1] | The Education Services goodwill balance as of April 30, 2021 includes a cumulative pretax noncash goodwill impairment of $110.0 million.

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