Quarterly report pursuant to Section 13 or 15(d)

Components of Accumulated Other Comprehensive Loss (Detail)

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Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Jul. 31, 2014
Apr. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustments $ (36,551) $ (20,919)    
Deferred compensation and pension plan adjustments, net of tax (19,261) (19,708)    
Unrealized gains on marketable securities, net of tax   4    
Accumulated other comprehensive loss, net $ (55,812) $ (40,623) $ (5,587) $ (2,388)