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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 410,901	$ 411,444	[1]
Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	165,958	168,325
Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	10,943	8,803
Licensing, Reprints, Backfiles, and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	39,488	38,230
Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	8,603	8,269
STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	66,064	63,600
Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	38,231	45,736
Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	778	1,210
Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	11,406	11,490
Licensing, Distribution, Advertising, and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	8,442	9,242
Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	29,160	26,337
Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	15,799	14,887
Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	16,029	15,315
Operating Segments [Member] | Research [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	224,992	223,627	[1]
Operating Segments [Member] | Research [Member] | Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	165,958	168,325
Operating Segments [Member] | Research [Member] | Open Access [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	10,943	8,803
Operating Segments [Member] | Research [Member] | Licensing, Reprints, Backfiles, and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	39,488	38,230
Operating Segments [Member] | Research [Member] | Publishing Technology Services (Atypon) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	8,603	8,269
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
Operating Segments [Member] | Research [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	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
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
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
Operating Segments [Member] | Research [Member] | Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	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
Operating Segments [Member] | Research [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0
Operating Segments [Member] | Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	124,921	131,278	[1]
Operating Segments [Member] | Publishing [Member] | Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	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
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
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
Operating Segments [Member] | Publishing [Member] | STM and Professional Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	66,064	63,600
Operating Segments [Member] | Publishing [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	38,231	45,736
Operating Segments [Member] | Publishing [Member] | Course Workflow (WileyPLUS) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	778	1,210
Operating Segments [Member] | Publishing [Member] | Test Preparation and Certification [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	11,406	11,490
Operating Segments [Member] | Publishing [Member] | Licensing, Distribution, Advertising, and Other [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	8,442	9,242
Operating Segments [Member] | Publishing [Member] | Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	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
Operating Segments [Member] | Publishing [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	0	0
Operating Segments [Member] | Solutions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	60,988	56,539	[1]
Operating Segments [Member] | Solutions [Member] | Journal Subscriptions [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	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
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
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
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
Operating Segments [Member] | Solutions [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	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
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
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
Operating Segments [Member] | Solutions [Member] | Education Services (OPM) [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	29,160	26,337
Operating Segments [Member] | Solutions [Member] | Professional Assessment [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	15,799	14,887
Operating Segments [Member] | Solutions [Member] | Corporate Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 16,029	$ 15,315
[1] Due to the retrospective adoption of ASU 2017-07, total net benefits of $1.9 million related to defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended July 31, 2017 was $1.0 million in Research, $0.5 million in Publishing, and $0.4 million in Corporate expenses.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 606
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