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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Foreign currency translation adjustments $ (63,900) $ (60,270)
Deferred compensation and pension plan adjustments, net of tax (14,905) (16,838)
Marketable securities unrealized loss, net of tax (5)  
Interest rate swap unrealized gain, net of tax   456
Accumulated other comprehensive loss, net $ (78,810) $ (76,652)