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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 449,367	$ 455,675	$ 1,308,890	$ 1,318,850
Journals Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	152,291	160,287	482,000	498,775
Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	14,194	9,905	38,917	28,058
Licensing, Reprints, Backfiles and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	50,804	45,035	132,041	124,594
Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,064	8,262	27,032	24,559
STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	64,599	80,775	197,565	215,835
Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	37,437	48,446	127,736	151,893
Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	22,935	21,406	42,142	38,926
Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,560	7,758	29,343	27,167
Licensing, Distribution, Advertising and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	11,104	11,859	31,269	32,686
Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	46,207	32,242	105,244	88,316
Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	14,600	13,228	47,667	43,936
Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	16,572	16,472	47,934	44,105
Operating Segments [Member] | Research [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	226,353	223,489	679,990	675,986
Operating Segments [Member] | Research [Member] | Journals Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	152,291	160,287	482,000	498,775
Operating Segments [Member] | Research [Member] | Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	14,194	9,905	38,917	28,058
Operating Segments [Member] | Research [Member] | Licensing, Reprints, Backfiles and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	50,804	45,035	132,041	124,594
Operating Segments [Member] | Research [Member] | Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,064	8,262	27,032	24,559
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 [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	145,635	170,244	428,055	466,507
Operating Segments [Member] | Publishing [Member] | Journals 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	64,599	80,775	197,565	215,835
Operating Segments [Member] | Publishing [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	37,437	48,446	127,736	151,893
Operating Segments [Member] | Publishing [Member] | Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	22,935	21,406	42,142	38,926
Operating Segments [Member] | Publishing [Member] | Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,560	7,758	29,343	27,167
Operating Segments [Member] | Publishing [Member] | Licensing, Distribution, Advertising and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	11,104	11,859	31,269	32,686
Operating Segments [Member] | Publishing [Member] | Education Services [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	77,379	61,942	200,845	176,357
Operating Segments [Member] | Solutions [Member] | Journals 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 [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	46,207	32,242	105,244	88,316
Operating Segments [Member] | Solutions [Member] | Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	14,600	13,228	47,667	43,936
Operating Segments [Member] | Solutions [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 16,572	$ 16,472	$ 47,934	$ 44,105

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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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