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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, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Segment Information [Abstract]
Revenue, net	$ 536,300	$ 482,900	$ 491,000	$ 431,300	$ 474,700	$ 467,100	$ 466,200	$ 423,500	$ 1,941,501	$ 1,831,483	$ 1,800,069
Technology, property and equipment, net	282,270				298,005				282,270	298,005	289,021
Reportable Geographical Components [Member] | United States [Member]
Segment Information [Abstract]
Revenue, net									990,499	944,075	932,927
Technology, property and equipment, net	241,217				261,296				241,217	261,296	252,459
Reportable Geographical Components [Member] | United Kingdom [Member]
Segment Information [Abstract]
Revenue, net									145,806	174,567	150,242
Technology, property and equipment, net	19,436				18,076				19,436	18,076	18,331
Reportable Geographical Components [Member] | China [Member]
Segment Information [Abstract]
Revenue, net									92,305	58,870	55,024
Technology, property and equipment, net	567				492				567	492	688
Reportable Geographical Components [Member] | Japan [Member]
Segment Information [Abstract]
Revenue, net									91,957	75,104	77,145
Technology, property and equipment, net	234				112				234	112	87
Reportable Geographical Components [Member] | Germany [Member]
Segment Information [Abstract]
Revenue, net									78,035	113,664	97,505
Technology, property and equipment, net	8,459				8,059				8,459	8,059	8,423
Reportable Geographical Components [Member] | Canada [Member]
Segment Information [Abstract]
Revenue, net									67,635	56,370	50,882
Technology, property and equipment, net	1,067				1,734				1,067	1,734	2,659
Reportable Geographical Components [Member] | Australia [Member]
Segment Information [Abstract]
Revenue, net									57,569	73,718	77,453
Technology, property and equipment, net	890				1,051				890	1,051	1,440
Reportable Geographical Components [Member] | France [Member]
Segment Information [Abstract]
Revenue, net									45,681	45,033	51,441
Technology, property and equipment, net	4,329				1,358				4,329	1,358	403
Reportable Geographical Components [Member] | Scandinavia [Member]
Segment Information [Abstract]
Revenue, net									39,836	29,682	30,971
Technology, property and equipment, net	112				223				112	223	229
Reportable Geographical Components [Member] | Other Countries [Member]
Segment Information [Abstract]
Revenue, net									332,178	260,400	276,479
Technology, property and equipment, net	$ 5,959				$ 5,604				$ 5,959	$ 5,604	$ 4,302

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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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