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Acquisitions (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2019 USD ($) | Nov. 01, 2018 USD ($) | Oct. 31, 2019 USD ($) Business | Jul. 31, 2019 Business | Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) $ / shares shares | Apr. 30, 2019 USD ($)
Acquisitions [Abstract] |  |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired |  |  |  |  | $ 74,169 | $ 0 |
Assets [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | $ 1,143,197 |  | 1,143,197 |  | $ 1,095,666
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | 1,143,197 |  | 1,143,197 |  | 1,095,666
Research Publishing & Platforms [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | 439,995 |  | 439,995 |  | 438,511
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | 439,995 |  | 439,995 |  | 438,511
Academic and Professional Learning [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | 504,031 |  | 504,031 |  | 458,145
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | 504,031 |  | 504,031 |  | $ 458,145
zybooks [Member] |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |
Total cash consideration transferred at the acquisition date | $ 55,884 |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Current Assets | 2,280 |  |  |  |  |  |
Technology, Property and Equipment, net | 28 |  |  |  |  |  |
Intangible Assets, net | 24,500 |  |  |  |  |  |
Goodwill | 37,246 |  |  |  |  |  |
Total Assets | 64,054 |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Current Liabilities | 2,581 |  |  |  |  |  |
Deferred Income Tax Liabilities | 5,589 |  |  |  |  |  |
Total Liabilities | 8,170 |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Identifiable intangible assets acquired | 24,500 |  |  |  |  |  |
Goodwill | 37,246 |  |  |  |  |  |
zybooks [Member] | Academic and Professional Learning [Member] |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |
Fair value of consideration transferred | 57,000 |  |  |  |  |  |
Fair value of additional consideration to be paid after the acquisition date | 1,100 |  |  |  |  |  |
Cash acquired | 1,800 |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired | 54,300 |  |  |  |  |  |
zybooks [Member] | Developed Technology [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Identifiable intangible assets acquired | $ 10,400 |  |  |  |  |  |
Weighted-average useful life | 7 years |  |  |  |  |  |
zybooks [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Identifiable intangible assets acquired | $ 6,800 |  |  |  |  |  |
Weighted-average useful life | 10 years |  |  |  |  |  |
zybooks [Member] | Content [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Identifiable intangible assets acquired | $ 4,400 |  |  |  |  |  |
Weighted-average useful life | 10 years |  |  |  |  |  |
zybooks [Member] | Trademarks [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Identifiable intangible assets acquired | $ 2,900 |  |  |  |  |  |
Weighted-average useful life | 10 years |  |  |  |  |  |
Other Acquisitions [Member] |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired |  |  |  |  | 19,900 |  |
Assets [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | 9,400 |  | 9,400 |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Identifiable intangible assets acquired |  |  |  |  | 16,200 |  |
Goodwill |  |  | $ 9,400 |  | $ 9,400 |  |
Other Acquisitions [Member] | Research Publishing & Platforms [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Number of immaterial businesses acquired | Business |  |  |  | 2 |  |  |
Other Acquisitions [Member] | Academic and Professional Learning [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Number of immaterial businesses acquired | Business |  |  | 1 |  |  |  |
The Learning House, Inc. [Member] |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |
Fair value of consideration transferred |  | $ 201,300 |  |  |  |  |
Cash acquired |  | 10,300 |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired |  | 190,400 |  |  |  |  |
Total cash consideration transferred at the acquisition date |  | 200,700 |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Percentage of ownership interest acquired |  |  |  |  |  | 100.00% |
The Learning House, Inc. [Member] | Warrants [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Term of warrants |  |  | 3 years |  | 3 years |  |
Issuance of warrants |  | $ 600 |  |  |  |  |
The Learning House, Inc. [Member] | Common Stock Class A [Member] | Warrants [Member] |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |
Number of shares of common stock warrant holders are allowed to purchase (in shares) | shares |  |  |  |  |  | 400,000 |
Exercise price per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 90.00 |

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