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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