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Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustments $ (32,399) $ (55,359)
Deferred compensation and pension plan adjustments, net of taxes (9,073) (15,127)
Interest rate swap unrealized gain (loss), net of taxes 1,337 (578)
Accumulated other comprehensive loss, net $ (40,135) $ (71,064)