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Components of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Deferred compensation and benefit pension plan adjustments, net of taxes $ (17,052)   $ (18,006)      
Foreign currency translation adjustment (631)   15,604      
Unrealized gains on marketable securities, net of taxes 12   14      
Accumulated other comprehensive loss, net $ (17,671) $ (5,587) $ (2,388) $ (1,322) $ (5,714) $ (2,631)