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Consolidated Statement of Changes in Stockholders' Equity - 9 months ended Jan. 31, 2016 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive (Loss)/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 54,062,459 69,625,000        
Treasury stock, shares at Apr. 30, 2015 15,562,622         15,563,000
Proceeds from exercise of employee stock options $ 5,898 $ 1 5,897      
Proceeds from exercise of employee stock options (in shares) 707,179 706,000        
Stock-based compensation $ 4,885   4,885      
Excess tax benefit for stock-based compensation 3,123   3,123      
Shares issued under employee stock purchase plan $ 770   770      
Shares issued under employee stock purchase plan (in shares) 92,249 92,000        
Change in unrealized loss on interest rate swap, net of tax effect $ (773)       (773)  
Issuance of common stock under restricted stock unit awards, net of shares surrendered (2,073)   (2,073)      
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares)   248,000        
Net income 58,311     58,311    
Balance at Jan. 31, 2016 $ 264,511 $ 71 $ 231,800 $ 205,663 $ (700) $ (172,323)
Balance (in shares) at Jan. 31, 2016 55,108,668 70,671,000        
Treasury stock, shares at Jan. 31, 2016 15,562,622         15,563,000