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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Jan. 31, 2020
Jan. 31, 2019
Stockholders' Equity                
Balance $ 696,039 $ 662,295 $ 629,176 $ 641,259 $ 619,280 $ 579,451 $ 629,176 $ 579,451
Foreign currency translation adjustments (2,504) (409) 11,860 (128) (4,902) (3,791) 8,947 (8,821)
Balance 707,326 696,039 662,295 633,760 641,259 619,280 707,326 633,760
Other comprehensive loss on derivative instruments before reclassification, tax             3,200  
Accumulated Other Comprehensive Income (Loss)                
Stockholders' Equity                
Balance (24,790) (20,779) (26,574) (7,761) (3,237) 441 (26,574) 441
Foreign currency translation adjustments (2,504) (409) 11,860 (128) (4,902) (3,791) 8,947  
Other comprehensive loss on derivative instruments             (10,214)  
Balance $ (27,841) $ (24,790) $ (20,779) $ (7,889) $ (7,761) $ (3,237) $ (27,841) $ (7,889)