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Comprehensive Income - Components of Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Apr. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustments $ (25,501) $ (55,359)
Deferred compensation and pension plan adjustments, net of tax (14,062) (15,127)
Interest rate swap unrealized gain (loss), net of taxes 892 (578)
Accumulated other comprehensive loss, net $ (38,671) $ (71,064)