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Acquisitions (Details) $ / shares in Units, € in Millions					3 Months Ended								12 Months Ended
	Jan. 01, 2020 USD ($)	Jan. 01, 2020 EUR (€)	Jul. 01, 2019 USD ($)	Nov. 01, 2018 USD ($)	Apr. 30, 2020 USD ($) Business shares	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($) Business	Jul. 31, 2019 USD ($) Business	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2018 USD ($)	Apr. 30, 2020 USD ($) shares	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)
Acquisitions [Abstract]
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired													$ 229,629,000	$ 190,415,000	$ 0
Revenue					$ 474,700,000	$ 467,100,000	$ 466,200,000	$ 423,500,000	$ 491,200,000	$ 449,400,000	$ 448,600,000	$ 410,900,000	1,831,483,000	1,800,069,000	1,796,103,000
Operating income (loss)					(170,700,000)	$ 48,500,000	$ 63,400,000	$ 4,500,000	80,100,000	$ 50,300,000	57,500,000	$ 36,100,000	(54,287,000)	223,989,000	231,461,000
Assets [Abstract]
Goodwill					1,116,790,000				1,095,666,000				1,116,790,000	1,095,666,000
Operating Lease Right-of-Use Assets					142,716,000				0				142,716,000	0
Liabilities [Abstract]
Operating Lease Liabilities					$ 181,592,000								$ 181,592,000
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								400,000
Research Publishing and Platforms [Member]
Acquisitions [Abstract]
Revenue													$ 948,839,000	939,217,000	936,857,000
Assets [Abstract]
Goodwill					$ 448,130,000				438,511,000				448,130,000	438,511,000
Academic and Professional Learning [Member]
Acquisitions [Abstract]
Revenue													650,789,000	703,303,000	740,115,000
Assets [Abstract]
Goodwill					501,091,000				458,145,000				501,091,000	458,145,000
Education Services [Member]
Acquisitions [Abstract]
Revenue													231,855,000	157,549,000	$ 119,131,000
Assets [Abstract]
Goodwill					167,569,000				$ 199,010,000				167,569,000	199,010,000
Mthree [Member]
Acquisitions [Abstract]
Fair value of consideration transferred	$ 128,600,000	€ 97.5
Fair value of additional consideration to be paid after the acquisition date	6,400,000
Cash acquired	2,200,000
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired	$ 126,400,000
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													1,300,000
Total cash consideration transferred	122,242,000
Assets [Abstract]
Current Assets	8,750,000
Technology, Property and Equipment, net	484,000
Intangible Assets, net	56,836,000
Goodwill	82,561,000
Operating Lease Right-of-Use Assets	3,710,000
Total Assets	152,341,000
Liabilities [Abstract]
Current Liabilities	14,380,000
Deferred Income Tax Liabilities	12,722,000
Operating Lease Liabilities	2,692,000
Other Long-Term Liabilities	305,000
Total Liabilities	30,099,000
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired	$ 56,836,000
Percentage of ownership interest acquired	100.00%
Mthree [Member] | Education Services [Member]
Acquisitions [Abstract]
Revenue													17,500
Operating income (loss)													1,700,000
Mthree [Member] | Customer Relationships [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired	$ 48,792,000
Weighted-average useful life	12 years	12 years
Mthree [Member] | Content [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired	$ 1,319,000
Weighted-average useful life	4 years	4 years
Mthree [Member] | Trademarks [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired	$ 6,725,000
Weighted-average useful life	10 years	10 years
zybooks [Member]
Acquisitions [Abstract]
Total cash consideration transferred			$ 55,939,000
Assets [Abstract]
Current Assets			2,280,000
Technology, Property and Equipment, net			28,000
Intangible Assets, net			24,500,000
Goodwill			36,903,000
Total Assets			63,711,000
Liabilities [Abstract]
Current Liabilities			2,581,000
Deferred Income Tax Liabilities			5,191,000
Total Liabilities			7,772,000
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired			24,500,000
zybooks [Member] | Academic and Professional Learning [Member]
Acquisitions [Abstract]
Fair value of consideration transferred			57,100,000
Fair value of additional consideration to be paid after the acquisition date			1,200,000
Cash acquired			1,800,000
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired			54,700,000
Revenue														13,500,000
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			$ 10,400,000
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			$ 6,800,000
Weighted-average useful life			10 years
zybooks [Member] | Content [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired			$ 4,400,000
Weighted-average useful life			10 years
zybooks [Member] | Trademarks [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired			$ 2,900,000
Weighted-average useful life			10 years
Other Acquisitions [Member]
Acquisitions [Abstract]
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired													48,500,000
Assets [Abstract]
Goodwill					27,900,000								27,900,000
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired													27,700,000
Other Acquisitions [Member] | Research Publishing and Platforms [Member]
Assets [Abstract]
Goodwill					19,400,000								19,400,000
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]
Assets [Abstract]
Goodwill					$ 8,500,000								$ 8,500,000
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Number of immaterial businesses acquired | Business							1
Other Acquisitions [Member] | Education Services [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Number of immaterial businesses acquired | Business					1
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													8 years
Other Acquisitions [Member] | Content [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Weighted-average useful life													10 years
The Learning House, Inc. [Member]
Acquisitions [Abstract]
Fair value of consideration transferred				$ 201,274,000
Cash acquired				10,300,000
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired				190,400,000
Total cash consideration transferred				200,700,000
Assets [Abstract]
Current Assets											20,353,000
Technology, Property and Equipment, net											343,000
Intangible Assets, net											109,548,000
Goodwill											110,966,000
Other non-current assets											5,025,000
Total Assets											246,235,000
Liabilities [Abstract]
Current Liabilities											16,999,000
Deferred Income Tax Liabilities											26,778,000
Other Long-Term Liabilities											1,184,000
Total Liabilities											$ 44,961,000
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired													$ 109,548,000
Percentage of ownership interest acquired											100.00%
The Learning House, Inc. [Member] | Education Services [Member]
Acquisitions [Abstract]
Revenue														31,500,000
Operating income (loss)														$ 8,000,000.0
The Learning House, Inc. [Member] | Customer Relationships [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired													$ 103,850,000
Weighted-average useful life													15 years
The Learning House, Inc. [Member] | Content [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Identifiable intangible assets acquired													$ 5,698,000
Weighted-average useful life													4 years
The Learning House, Inc. [Member] | Warrants [Member]
Identifiable intangible assets acquired and weighted-average useful life [Abstract]
Term of warrants											3 years
Issuance of warrants				$ 600,000
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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