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Acquisitions (Details) $ / shares in Units, $ in Thousands, € in Millions |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Jan. 01, 2020 EUR (€) | Jul. 01, 2019 USD ($) | Nov. 01, 2018 USD ($) | Jan. 31, 2020 USD ($) | Oct. 31, 2019 Business | Jul. 31, 2019 Business | Jan. 31, 2019 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Oct. 31, 2018 $ / shares shares
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired |  |  |  |  |  |  |  |  | $ 200,642 | $ 190,467 |  |
Revenue |  |  |  |  | $ 467,131 |  |  | $ 449,367 | 1,356,866 | 1,308,890 |  |
Operating income (loss) |  |  |  |  | 48,494 |  |  | $ 50,346 | 116,444 | $ 143,961 |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,226,257 |  |  |  | 1,226,257 |  | $ 1,095,666 |
Research Publishing & Platforms [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 443,837 |  |  |  | 443,837 |  | 438,511 |
Academic and Professional Learning [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 503,234 |  |  |  | 503,234 |  | 458,145 |
Education Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 279,186 |  |  |  | 279,186 |  | $ 199,010 |
mthree [Member] |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration transferred | $ 128,600 | € 97.5 |  |  |  |  |  |  |  |  |  |
Total cash consideration transferred at the acquisition date | 122,200 |  |  |  |  |  |  |  |  |  |  |
Fair value of additional consideration to be paid after the acquisition date | 6,400 |  |  |  |  |  |  |  |  |  |  |
Cash acquired | 2,300 |  |  |  |  |  |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired | $ 126,300 |  |  |  |  |  |  |  |  |  |  |
Period over which cash payment will be made upon reaching certain revenue and Adjusted EBITDA targets | 4 years | 4 years |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes | $ 0 |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | 800 |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, net | 57,400 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 80,300 |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets acquired and weighted-average useful life [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |
mthree [Member] | Education Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 4,500 |  |  |  | 4,500 |  |  |
Operating income (loss) |  |  |  |  | (1,200) |  |  |  | (1,200) |  |  |
zybooks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total cash consideration transferred at the acquisition date |  |  | $ 55,939 |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Current Assets |  |  | 2,280 |  |  |  |  |  |  |  |  |
Technology, Property and Equipment, net |  |  | 28 |  |  |  |  |  |  |  |  |
Intangible Assets, net |  |  | 24,500 |  |  |  |  |  |  |  |  |
Goodwill |  |  | 37,301 |  |  |  |  |  |  |  |  |
Total Assets |  |  | 64,109 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
zybooks [Member] | Academic and Professional Learning [Member] |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration transferred |  |  | 57,100 |  |  |  |  |  |  |  |  |
Fair value of additional consideration to be paid after the acquisition date |  |  | 1,200 |  |  |  |  |  |  |  |  |
Cash acquired |  |  | 1,800 |  |  |  |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired |  |  | 54,500 |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 3,900 |  |  |  | 8,800 |  |  |
Goodwill deductible for tax purposes |  |  | 0 |  |  |  |  |  |  |  |  |
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 |  |  |
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 |  |  |  |  |  |  |  |
Total cash consideration transferred at the acquisition date |  |  |  | 200,700 |  |  |  |  |  |  |  |
Cash acquired |  |  |  | 10,300 |  |  |  |  |  |  |  |
Fair value of cash consideration transferred, net of cash acquired |  |  |  | 190,400 |  |  |  |  |  |  |  |
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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