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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2019
Stockholders’ Equity    
Balance   $ 579,451
Foreign currency translation adjustments $ (128) (8,821)
Balance 633,760 633,760
Accumulated Other Comprehensive Income (Loss)    
Stockholders’ Equity    
Balance   441
Foreign currency translation adjustments   (8,821)
Other comprehensive loss on interest rate cap   (237)
Reclassification to earnings from accumulated other comprehensive income for interest rate cap   728
Balance $ (7,889) $ (7,889)