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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017		Oct. 31, 2018	Oct. 31, 2017
Segment information [Abstract]
Revenue	$ 448,622	$ 451,731		$ 859,523	$ 863,175
Contribution to Profit	105,411	119,368	[1]	179,481	182,332	[1]
Corporate Expenses	(47,936)	(38,580)		(85,866)	(88,974)
Operating Income	57,475	80,788	[1]	93,615	93,358	[1]
Net benefits	(1,872)	(1,683)		(3,919)	(3,382)
Operating and Administrative Expenses [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		2,000			3,900
Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits	(2,100)	(2,000)		(4,500)	(3,900)
Research [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		(1,000)			(2,000)
Publishing [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		(600)			(1,100)
Operating Segments [Member] | Research [Member]
Segment information [Abstract]
Revenue	228,645	228,870		453,637	452,497
Contribution to Profit	58,907	70,146		116,033	130,608
Operating Segments [Member] | Publishing [Member]
Segment information [Abstract]
Revenue	157,499	164,985		282,420	296,263
Contribution to Profit	39,455	41,913		53,175	46,383
Operating Segments [Member] | Solutions [Member]
Segment information [Abstract]
Revenue	62,478	57,876		123,466	114,415
Contribution to Profit	$ 7,049	7,309		$ 10,273	5,341
Corporate [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		$ (400)			$ (800)
[1] Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $3.9 million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other for the three and six months ended October 31, 2017, respectively. 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 October 31, 2017 was $1.0 million in Research, $0.6 million in Publishing, and $0.4 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the six months ended October 31, 2017 was $2.0 million in Research, $1.1 million in Publishing, and $0.8 million in Corporate expenses.

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