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Condensed Consolidated Statement of Changes in Stockholders' Equity - 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   72,434,000        
Treasury stock, shares at Apr. 30, 2018           18,167,000
Proceeds from exercise of employee stock options $ 215   215      
Proceeds from exercise of employee stock options (in shares) 32,899 33,000        
Stock-based compensation $ 3,952   3,952      
Shares issued under employee stock purchase plan 943   943      
Shares issued under employee stock (in shares)   108,000        
Change in unrealized loss on interest rate swap, net of tax effect (117)       (117)  
Impact of adoption of accounting standard updates (4,610)     (4,610)    
Issuance of common stock under restricted stock unit awards, net of shares surrendered (599) $ 1 (600)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   131,000        
Net income (loss) 14,310     14,310    
Balance at Oct. 31, 2018 436,242 $ 73 258,126 398,846 1,572 $ (222,375)
Balance (in shares) at Oct. 31, 2018   72,706,000        
Treasury stock, shares at Oct. 31, 2018           18,167,000
Balance at Jul. 31, 2018 426,680 $ 73 255,189 392,181 1,612 $ (222,375)
Balance (in shares) at Jul. 31, 2018   72,551,000        
Treasury stock, shares at Jul. 31, 2018           18,167,000
Proceeds from exercise of employee stock options 76   76      
Proceeds from exercise of employee stock options (in shares)   16,000        
Stock-based compensation 1,962   1,962      
Shares issued under employee stock purchase plan 943   943      
Shares issued under employee stock (in shares)   108,000        
Change in unrealized loss on interest rate swap, net of tax effect (40)       (40)  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (44)   (44)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   31,000        
Net income (loss) 6,665     6,665    
Balance at Oct. 31, 2018 436,242 $ 73 258,126 398,846 1,572 $ (222,375)
Balance (in shares) at Oct. 31, 2018   72,706,000        
Treasury stock, shares at Oct. 31, 2018           18,167,000
Balance at Apr. 30, 2019 $ 444,444 $ 73 263,180 402,946 620 $ (222,375)
Balance (in shares) at Apr. 30, 2019 54,696,762 72,864,000        
Treasury stock, shares at Apr. 30, 2019 18,166,862         18,167,000
Proceeds from exercise of employee stock options $ 74   74      
Proceeds from exercise of employee stock options (in shares) 15,000 15,000        
Stock-based compensation $ 3,016   3,016      
Shares issued under employee stock purchase plan 862   862      
Shares issued under employee stock (in shares)   173,000        
Change in unrealized loss on interest rate swap, net of tax effect (481)       (481)  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (550)   (550)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   174,000        
Net income (loss) (815)     (815)    
Balance at Oct. 31, 2019 $ 446,550 $ 73 266,582 402,131 139 $ (222,375)
Balance (in shares) at Oct. 31, 2019 55,059,279 73,226,000        
Treasury stock, shares at Oct. 31, 2019 18,166,862         18,167,000
Balance at Jul. 31, 2019 $ 443,058 $ 73 264,230 400,838 292 $ (222,375)
Balance (in shares) at Jul. 31, 2019   72,988,000        
Treasury stock, shares at Jul. 31, 2019           18,167,000
Proceeds from exercise of employee stock options 74   74      
Proceeds from exercise of employee stock options (in shares)   15,000        
Stock-based compensation 1,428   1,428      
Shares issued under employee stock purchase plan 862   862      
Shares issued under employee stock (in shares)   173,000        
Change in unrealized loss on interest rate swap, net of tax effect (153)       (153)  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (12)   (12)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   50,000        
Net income (loss) 1,293     1,293    
Balance at Oct. 31, 2019 $ 446,550 $ 73 $ 266,582 $ 402,131 $ 139 $ (222,375)
Balance (in shares) at Oct. 31, 2019 55,059,279 73,226,000        
Treasury stock, shares at Oct. 31, 2019 18,166,862         18,167,000