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Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Jul. 31, 2018	Jul. 31, 2017
Segment information [Abstract]
Revenue		$ 410,901	$ 411,444	[1]
Contribution to Profit	[1]	74,070	62,964
Corporate Expenses	[1]	(37,930)	(50,394)
Operating Income	[1]	36,140	12,570
Net benefits		(2,047)	(1,699)
Operating and Administrative Expenses [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits			1,900
Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		(2,400)	(1,900)
Research [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits			(1,000)
Publishing [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits			(500)
Operating Segments [Member] | Research [Member]
Segment information [Abstract]
Revenue		224,992	223,627	[1]
Contribution to Profit		57,126	60,462	[1]
Operating Segments [Member] | Publishing [Member]
Segment information [Abstract]
Revenue		124,921	131,278	[1]
Contribution to Profit		13,720	4,470	[1]
Operating Segments [Member] | Solutions [Member]
Segment information [Abstract]
Revenue		60,988	56,539	[1]
Contribution to Profit		$ 3,224	(1,968)	[1]
Corporate [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits			$ (400)
[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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