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Condensed Consolidated Statement of Changes in Stockholders' Equity - 3 months ended Jul. 31, 2018 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income/(Loss)
Treasury Stock
Balance at Apr. 30, 2018 $ 422,148 $ 72 $ 253,616 $ 389,146 $ 1,689 $ (222,375)
Balance (in shares) at Apr. 30, 2018 54,266,843 72,434,000        
Treasury stock, shares at Apr. 30, 2018 18,166,862         18,167,000
Proceeds from exercise of employee stock options $ 139   139      
Proceeds from exercise of employee stock options (in shares) 17,399 17,000        
Stock-based compensation $ 1,990   1,990      
Change in unrealized loss on interest rate swap, net of tax effect (77)       (77)  
Impact of adoption of accounting standard updates (4,610)     (4,610)    
Issuance of common stock under restricted stock unit awards, net of shares surrendered (555) $ 1 (556)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   100,000        
Net income 7,645     7,645    
Balance at Jul. 31, 2018 $ 426,680 $ 73 $ 255,189 $ 392,181 $ 1,612 $ (222,375)
Balance (in shares) at Jul. 31, 2018 54,383,566 72,551,000        
Treasury stock, shares at Jul. 31, 2018 18,166,862         18,167,000