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Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Jul. 31, 2017
Apr. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustments $ (39,275) $ (55,359)
Deferred compensation and pension plan adjustments, net of tax (14,775) (15,127)
Interest rate swap unrealized loss, net of taxes (641) (578)
Accumulated other comprehensive loss, net $ (54,691) $ (71,064)