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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 448,622	$ 451,731	$ 859,523	$ 863,175
Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	163,751	170,163	329,709	338,488
Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	13,780	9,350	24,723	18,153
Licensing, Reprints, Backfiles and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	41,749	41,329	81,237	79,559
Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,365	8,028	17,968	16,297
STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	66,902	71,460	132,966	135,060
Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	52,068	57,711	90,299	103,447
Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	18,429	16,310	19,207	17,520
Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	8,377	7,919	19,783	19,409
Licensing, Distribution, Advertising and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	11,723	11,585	20,165	20,827
Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	29,877	29,737	59,037	56,074
Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	17,268	15,821	33,067	30,708
Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	15,333	12,318	31,362	27,633
Operating Segments [Member] | Research [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	228,645	228,870	453,637	452,497
Operating Segments [Member] | Research [Member] | Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	163,751	170,163	329,709	338,488
Operating Segments [Member] | Research [Member] | Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	13,780	9,350	24,723	18,153
Operating Segments [Member] | Research [Member] | Licensing, Reprints, Backfiles and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	41,749	41,329	81,237	79,559
Operating Segments [Member] | Research [Member] | Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,365	8,028	17,968	16,297
Operating Segments [Member] | Research [Member] | STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Licensing, Distribution, Advertising and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Research [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	157,499	164,985	282,420	296,263
Operating Segments [Member] | Publishing [Member] | Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member] | Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member] | Licensing, Reprints, Backfiles and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member] | Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member] | STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	66,902	71,460	132,966	135,060
Operating Segments [Member] | Publishing [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	52,068	57,711	90,299	103,447
Operating Segments [Member] | Publishing [Member] | Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	18,429	16,310	19,207	17,520
Operating Segments [Member] | Publishing [Member] | Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	8,377	7,919	19,783	19,409
Operating Segments [Member] | Publishing [Member] | Licensing, Distribution, Advertising and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	11,723	11,585	20,165	20,827
Operating Segments [Member] | Publishing [Member] | Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member] | Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Publishing [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	62,478	57,876	123,466	114,415
Operating Segments [Member] | Solutions [Member] | Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Licensing, Reprints, Backfiles and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Licensing, Distribution, Advertising and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0	0	0
Operating Segments [Member] | Solutions [Member] | Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	29,877	29,737	59,037	56,074
Operating Segments [Member] | Solutions [Member] | Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	17,268	15,821	33,067	30,708
Operating Segments [Member] | Solutions [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 15,333	$ 12,318	$ 31,362	$ 27,633

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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