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Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Oct. 31, 2016
Apr. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustments $ (54,598) $ (36,339)
Deferred compensation and pension plan adjustments, net of tax (20,645) (21,572)
Accumulated other comprehensive loss, net $ (75,243) $ (57,911)