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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018		Jan. 31, 2019	Jan. 31, 2018
Segment information [Abstract]
Revenue	$ 449,367	$ 455,675		$ 1,308,890	$ 1,318,850
Contribution to Profit	90,811	112,551	[1]	270,292	294,883	[1]
Corporate Expenses	(40,465)	(47,157)		(126,331)	(136,131)
Operating Income	50,346	65,394	[1]	143,961	158,752	[1]
Net benefits	(1,904)	(1,762)		(5,823)	(5,144)
Operating and Administrative Expenses [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		2,000			6,000
Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits	2,100	(2,000)		6,600	(6,000)
Research [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		(1,000)			(3,100)
Publishing [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		(600)			(1,700)
Operating Segments [Member] | Research [Member]
Segment information [Abstract]
Revenue	226,353	223,489		679,990	675,986
Contribution to Profit	60,532	58,253		176,565	188,861
Operating Segments [Member] | Publishing [Member]
Segment information [Abstract]
Revenue	145,635	170,244		428,055	466,507
Contribution to Profit	33,706	47,895		86,881	94,278
Operating Segments [Member] | Solutions [Member]
Segment information [Abstract]
Revenue	77,379	61,942		200,845	176,357
Contribution to Profit	$ (3,427)	6,403		$ 6,846	11,744
Corporate [Member] | Interest and Other Income [Member] | ASU 2017-07 Member]
Segment information [Abstract]
Net benefits		$ (400)			$ (1,200)
[1] Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $6.0 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 nine months ended January 31, 2018, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended January 31, 2018 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 nine months ended January 31, 2018 was $3.1 million in Research, $1.7 million in Publishing, and $1.2 million in Corporate expenses.

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