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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Balance at Apr. 30, 2015 $ 194,370 $ 70 $ 219,198 $ 147,352 $ 73 $ (172,323)
Balance (in shares) at Apr. 30, 2015   69,625,000        
Treasury stock, shares at Apr. 30, 2015           15,563,000
Proceeds from exercise of employee stock options $ 9,570 $ 2 9,568      
Proceeds from exercise of employee stock options (in shares) 1,490,270 1,490,000        
Stock-based compensation $ 6,472   6,472      
Excess tax benefit for stock-based compensation 5,218   5,218      
Shares issued under employee stock purchase plan 1,695   1,695      
Shares issued under employee stock purchase plan (in shares)   158,000        
Change in unrealized income (loss) on interest rate swap, net of tax effect (821)       (821)  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (2,646)   (2,646)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   286,000        
Net income 93,958     93,958    
Balance at Apr. 30, 2016 307,816 $ 72 239,505 241,310 (748) $ (172,323)
Balance (in shares) at Apr. 30, 2016   71,559,000        
Treasury stock, shares at Apr. 30, 2016           15,563,000
Proceeds from exercise of employee stock options $ 193   193      
Proceeds from exercise of employee stock options (in shares) 54,200 54,000        
Repurchase of common stock $ (50,052)         $ (50,052)
Repurchase of common stock (in shares) (2,600,000)         2,604,000
Stock-based compensation $ 8,590   8,590      
Shares issued under employee stock purchase plan 2,249   2,249      
Shares issued under employee stock purchase plan (in shares)   144,000        
Change in unrealized income (loss) on interest rate swap, net of tax effect 1,184       1,184  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (4,672)   (4,672)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   260,000        
Net income 127,854     127,854    
Balance at Apr. 30, 2017 $ 393,162 $ 72 245,865 369,164 436 $ (222,375)
Balance (in shares) at Apr. 30, 2017 53,850,426 72,017,000        
Treasury stock, shares at Apr. 30, 2017 18,166,862         18,167,000
Proceeds from exercise of employee stock options $ 67   67      
Proceeds from exercise of employee stock options (in shares) 19,000 19,000        
Repurchase of common stock (in shares) 0          
Stock-based compensation $ 7,815   7,815      
Shares issued under employee stock purchase plan 2,146   2,146      
Shares issued under employee stock purchase plan (in shares)   203,000        
Change in unrealized income (loss) on interest rate swap, net of tax effect 1,107       1,107  
Reclassification due to U.S. Tax Reform       (146) 146  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (2,277)   (2,277)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   195,000        
Net income 20,128     20,128    
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