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Provision Benefit For Domestic And Foreign Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Current income taxes:      
Federal $ 6,982 $ 4,100 $ 4,173
State 1,939 1,237 1,609
Foreign 15,502 8,759 12,670
Current provision for income taxes 24,423 14,096 18,452
Deferred income taxes:      
Federal 5,094 (423) 7,281
State 177 1,895 3,508
Foreign (1,202) 1,069 (890)
Deferred provision for income taxes 4,069 2,541 9,899
Total provision for income taxes $ 28,492 $ 16,637 $ 28,351