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Comprehensive Income - Components of Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($)
$ in Thousands
Oct. 31, 2017
Apr. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustments $ (43,294) $ (55,359)
Deferred compensation and pension plan adjustments, net of tax (14,423) (15,127)
Interest rate swap unrealized loss, net of taxes (185) (578)
Accumulated other comprehensive loss, net $ (57,902) $ (71,064)