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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Stockholders’ Equity      
Balance $ 579,451 $ 514,606 $ 311,160
Foreign currency translation loss (22,320)    
Balance 629,176 579,451 514,606
Accumulated Other Comprehensive Income (Loss)      
Stockholders’ Equity      
Balance 441 (884) (1,148)
Foreign currency translation loss (22,320)    
Other comprehensive loss on derivative instruments before reclassification (5,423) 309 (118)
Reclassification to earnings from accumulated other comprehensive (loss) income 728 1,016 382
Balance (26,574) $ 441 $ (884)
Other comprehensive loss on derivative instruments before reclassification, tax $ (1,400)