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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Apr. 30, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Foreign currency translation adjustments $ (59,472) $ (32,399)
Deferred compensation and pension plan adjustments, net of tax (10,923) (9,073)
Interest rate swap unrealized gain, net of taxes 1,814 1,337
Accumulated other comprehensive loss, net $ (68,581) $ (40,135)