Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Segment Information, Revenues from External Customers and Long-Lived Assets by Geography Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 477,300	$ 455,700	$ 451,700	$ 411,400	$ 452,200	$ 436,400	$ 425,600	$ 404,300	$ 1,796,103	$ 1,718,530	$ 1,727,037
Long-lived assets	289,934				243,058				289,934	243,058	207,464
Reportable Geographical Components [Member] \| United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									913,852	786,574	884,185
Long-lived assets	249,542				208,572				249,542	208,572	166,878
Reportable Geographical Components [Member] \| United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									147,406	189,479	153,442
Long-lived assets	20,955				21,368				20,955	21,368	23,246
Reportable Geographical Components [Member] \| Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									98,404	75,090	69,676
Long-lived assets	9,259				8,770				9,259	8,770	9,629
Reportable Geographical Components [Member] \| Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									81,572	62,674	76,930
Long-lived assets	72				75				72	75	35
Reportable Geographical Components [Member] \| Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									78,270	66,309	78,786
Long-lived assets	1,454				591				1,454	591	1,041
Reportable Geographical Components [Member] \| China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									53,076	39,653	52,815
Long-lived assets	229				270				229	270	244
Reportable Geographical Components [Member] \| Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									55,568	50,740	50,243
Long-lived assets	3,635				1,232				3,635	1,232	1,617
Reportable Geographical Components [Member] \| France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									51,826	44,760	49,970
Long-lived assets	635				335				635	335	2,211
Reportable Geographical Components [Member] \| India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									41,637	34,306	38,208
Long-lived assets	1,437				245				1,437	245	234
Reportable Geographical Components [Member] \| Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									274,492	368,945	272,782
Long-lived assets	$ 2,716				$ 1,600				$ 2,716	$ 1,600	$ 2,329