Provision Benefit For Domestic And Foreign Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Current income taxes:
Federal	$ 13,087	$ 16,569	$ 6,982
State	3,271	2,412	1,939
Foreign	16,394	13,650	15,502
Current provision for income taxes	32,752	32,631	24,423
Deferred income taxes:
Federal	(5,334)	3,140	5,094
State	(1,838)	(239)	177
Foreign	(6,620)	(2,006)	(1,202)
Deferred (benefit) provision for income taxes	(13,792)	895	4,069
Total provision for income taxes	$ 18,960	$ 33,526	$ 28,492