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Segment Information, Revenues from External Customers and Technology, Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Segment Information [Abstract]
Revenue	$ 491,200	$ 449,400	$ 448,600	$ 410,900	$ 477,300	$ 455,700	$ 451,700	$ 411,400	$ 1,800,069	$ 1,796,103	$ 1,718,530
Technology, Property and Equipment, net	289,021				289,934				289,021	289,934	243,058
Reportable Geographical Components [Member] | United States [Member]
Segment Information [Abstract]
Revenue									932,927	913,852	786,574
Technology, Property and Equipment, net	252,459				249,542				252,459	249,542	208,572
Reportable Geographical Components [Member] | United Kingdom [Member]
Segment Information [Abstract]
Revenue									150,242	147,406	189,479
Technology, Property and Equipment, net	18,331				20,955				18,331	20,955	21,368
Reportable Geographical Components [Member] | Germany [Member]
Segment Information [Abstract]
Revenue									97,505	98,404	75,090
Technology, Property and Equipment, net	8,423				9,259				8,423	9,259	8,770
Reportable Geographical Components [Member] | Japan [Member]
Segment Information [Abstract]
Revenue									77,145	81,572	62,674
Technology, Property and Equipment, net	87				72				87	72	75
Reportable Geographical Components [Member] | Australia [Member]
Segment Information [Abstract]
Revenue									77,453	78,270	66,309
Technology, Property and Equipment, net	1,440				1,454				1,440	1,454	591
Reportable Geographical Components [Member] | China [Member]
Segment Information [Abstract]
Revenue									55,024	53,076	39,653
Technology, Property and Equipment, net	688				229				688	229	270
Reportable Geographical Components [Member] | Canada [Member]
Segment Information [Abstract]
Revenue									50,882	55,568	50,740
Technology, Property and Equipment, net	2,659				3,635				2,659	3,635	1,232
Reportable Geographical Components [Member] | France [Member]
Segment Information [Abstract]
Revenue									51,441	51,826	44,760
Technology, Property and Equipment, net	403				635				403	635	335
Reportable Geographical Components [Member] | India [Member]
Segment Information [Abstract]
Revenue									36,472	41,637	34,306
Technology, Property and Equipment, net	1,299				1,437				1,299	1,437	245
Reportable Geographical Components [Member] | Other Countries [Member]
Segment Information [Abstract]
Revenue									270,978	274,492	368,945
Technology, Property and Equipment, net	$ 3,232				$ 2,716				$ 3,232	$ 2,716	$ 1,600

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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