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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
Oct. 31, 2019
Apr. 30, 2019
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Foreign currency translation adjustments $ (64,303) $ (60,270)
Deferred compensation and pension plan adjustments, net of tax (15,848) (16,838)
Interest rate swap unrealized (loss) gain, net of tax (495) 456
Accumulated other comprehensive loss, net $ (80,646) $ (76,652)