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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Accumulated other comprehensive (loss) income      
Balance $ 629,176 $ 579,451 $ 514,606
Balance 633,981 629,176 579,451
Other comprehensive loss on derivative instruments before reclassification, tax 6,400 1,400  
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive (loss) income      
Balance (26,574) 441 (884)
Other comprehensive (loss) income before reclassification (38,508) (27,743) 309
Reclassification to earnings from accumulated other comprehensive (loss) income   728 1,016
Balance (65,082) (26,574) 441
Foreign Currency Translation      
Accumulated other comprehensive (loss) income      
Balance (22,320)    
Other comprehensive (loss) income before reclassification (18,257) (22,320)  
Balance (40,577) (22,320)  
Derivative Financial Instruments      
Accumulated other comprehensive (loss) income      
Balance (4,254) 441 (884)
Other comprehensive (loss) income before reclassification (20,251) (5,423) 309
Reclassification to earnings from accumulated other comprehensive (loss) income   728 1,016
Balance $ (24,505) $ (4,254) $ 441