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Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2021 USD ($) Segment	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment									3
Segment Information [Abstract]
Revenue	$ 536,300	$ 482,900	$ 491,000	$ 431,300	$ 474,700	$ 467,100	$ 466,200	$ 423,500	$ 1,941,501	$ 1,831,483	$ 1,800,069
Adjusted Contribution to Profit									218,821	180,668	227,107
Depreciation and Amortization									200,189	175,127	161,155
Operating Segments [Member]
Segment Information [Abstract]
Revenue									1,941,501	1,831,483	1,800,069
Adjusted Contribution to Profit									385,874	346,155	395,406
Depreciation and Amortization									185,517	163,433	147,132
Operating Segments [Member] | Research Publishing & Platforms [Member]
Segment Information [Abstract]
Revenue									1,015,349	948,839	939,217
Adjusted Contribution to Profit									273,023	265,353	260,885
Depreciation and Amortization									83,866	69,495	60,889
Operating Segments [Member] | Academic & Professional Learning [Member]
Segment Information [Abstract]
Revenue									644,537	650,789	703,303
Adjusted Contribution to Profit									91,676	84,646	147,404
Depreciation and Amortization									71,997	69,807	68,126
Operating Segments [Member] | Education Services [Member]
Segment Information [Abstract]
Revenue									281,615	231,855	157,549
Adjusted Contribution to Profit									21,175	(3,844)	(12,883)
Depreciation and Amortization									29,654	24,131	18,117
Corporate [Member]
Segment Information [Abstract]
Adjusted Contribution to Profit									(167,053)	(165,487)	(168,299)
Depreciation and Amortization									$ 14,672	$ 11,694	$ 14,023

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