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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Income Taxes [Line Items]
Deferred compensation	$ 71,182	$ 66,359
Loss and credit carryforwards	26,211	35,177
Reserves and accruals	9,344	8,706
Deferred rent	6,432	5,575
Deferred revenue	277	1,672
Allowance for doubtful accounts	1,831	1,536
Other	6,629	6,531
Gross deferred tax assets	121,906	125,556
Intangibles	(20,828)	(21,507)
Property and equipment	(6,289)	(6,277)
Prepaid expenses	(7,687)	(5,600)
Other	(5,653)	(5,678)
Gross deferred tax liabilities	(40,457)	(39,062)
Valuation allowances	(21,608)	(26,969)
Net deferred tax asset	$ 59,841	$ 59,525

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