Provision Benefit For Domestic And Foreign Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Current income taxes:
Federal	$ 16,569	$ 6,982	$ 4,100
State	2,412	1,939	1,237
Foreign	13,650	15,502	8,759
Current provision for income taxes	32,631	24,423	14,096
Deferred income taxes:
Federal	3,140	5,094	(423)
State	(239)	177	1,895
Foreign	(2,006)	(1,202)	1,069
Deferred provision for income taxes	895	4,069	2,541
Total provision for income taxes	$ 33,526	$ 28,492	$ 16,637