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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Stockholders' Equity    
Balance $ 629,176 $ 579,451
Foreign currency translation adjustments 11,860 (3,791)
Balance 662,295 619,280
Other comprehensive loss on derivative instruments before reclassification, tax 1,900  
Accumulated Other Comprehensive Income (Loss)    
Stockholders' Equity    
Balance (26,574) 441
Foreign currency translation adjustments 11,860 (3,791)
Other comprehensive loss on derivative instruments before reclassification (6,065)  
Balance $ (20,779) $ (3,237)