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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, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Segment Information [Abstract]
Revenue, net	$ 474,700	$ 467,100	$ 466,200	$ 423,500	$ 491,200	$ 449,400	$ 448,600	$ 410,900	$ 1,831,483	$ 1,800,069	$ 1,796,103
Technology, Property and Equipment, net	298,005				289,021				298,005	289,021	289,934
Reportable Geographical Components [Member] | United States [Member]
Segment Information [Abstract]
Revenue, net									944,075	932,927	913,852
Technology, Property and Equipment, net	261,296				252,459				261,296	252,459	249,542
Reportable Geographical Components [Member] | United Kingdom [Member]
Segment Information [Abstract]
Revenue, net									174,567	150,242	147,406
Technology, Property and Equipment, net	18,076				18,331				18,076	18,331	20,955
Reportable Geographical Components [Member] | Germany [Member]
Segment Information [Abstract]
Revenue, net									113,664	97,505	98,404
Technology, Property and Equipment, net	8,059				8,423				8,059	8,423	9,259
Reportable Geographical Components [Member] | Japan [Member]
Segment Information [Abstract]
Revenue, net									75,104	77,145	81,572
Technology, Property and Equipment, net	112				87				112	87	72
Reportable Geographical Components [Member] | Australia [Member]
Segment Information [Abstract]
Revenue, net									73,718	77,453	78,270
Technology, Property and Equipment, net	1,051				1,440				1,051	1,440	1,454
Reportable Geographical Components [Member] | China [Member]
Segment Information [Abstract]
Revenue, net									58,870	55,024	53,076
Technology, Property and Equipment, net	492				688				492	688	229
Reportable Geographical Components [Member] | Canada [Member]
Segment Information [Abstract]
Revenue, net									56,370	50,882	55,568
Technology, Property and Equipment, net	1,734				2,659				1,734	2,659	3,635
Reportable Geographical Components [Member] | France [Member]
Segment Information [Abstract]
Revenue, net									45,033	51,441	51,826
Technology, Property and Equipment, net	1,358				403				1,358	403	635
Reportable Geographical Components [Member] | Scandinavia [Member]
Segment Information [Abstract]
Revenue, net									29,682	30,971	31,695
Technology, Property and Equipment, net	223				229				223	229	309
Reportable Geographical Components [Member] | Other Countries [Member]
Segment Information [Abstract]
Revenue, net									260,400	276,479	284,434
Technology, Property and Equipment, net	$ 5,604				$ 4,302				$ 5,604	$ 4,302	$ 3,844

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- 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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