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Income Taxes (Provision (Benefit) For Domestic And Foreign Income Taxes) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Income Taxes [Abstract]      
Current income taxes, Federal $ 4,173 $ 7,606 $ 862
Current income taxes, State 1,609 5,714 2,281
Current income taxes, Foreign 12,670 11,826 6,738
Current provision for income taxes 18,452 25,146 9,881
Deferred income taxes, Federal 7,281 (2,442) (2,729)
Deferred income taxes, State 3,508 830 (1,303)
Deferred income taxes, Foreign (890) 9,158 (6,334)
Deferred provision (benefit) for income taxes 9,899 7,546 (10,366)
Total provision (benefit) for income taxes $ 28,351 $ 32,692 $ (485)