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Fee Revenue Classified by Country (Detail) - 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
Segment Reporting Information [Line Items]
Fee revenue	$ 475,364	$ 447,581	$ 443,018	$ 401,254	$ 406,065	$ 381,918	$ 401,917	$ 375,621	$ 1,767,217	$ 1,565,521	$ 1,292,112
UNITED STATES
Segment Reporting Information [Line Items]
Fee revenue									778,470	728,871	669,585
Other Countries
Segment Reporting Information [Line Items]
Fee revenue									$ 988,747	$ 836,650	$ 622,527

X

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

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(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

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