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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Comprehensive Income
Treasury Stock
Beginning Balance at Apr. 30, 2012 $ 112,844 $ 67 $ 189,379 $ (70,279) $ 73 $ (6,396)
Beginning Balance, Shares at Apr. 30, 2012   66,512,000       1,200,000
Exercise of employee stock options, Shares 834,508 836,000        
Exercise of employee stock options 3,418   3,418      
Stock-based compensation 1,951   1,951      
Tax deduction of stock-based compensation in excess of book deductions 984   984      
Shares issued under employee stock purchase plan, Shares   92,000        
Shares issued under employee stock purchase plan 666   666      
Issuance of common stock under restricted stock unit awards, Shares   8,000        
Net income 38,971     38,971    
Ending Balance at Oct. 31, 2012 $ 158,834 $ 67 $ 196,398 $ (31,308) $ 73 $ (6,396)
Ending Balance, Shares at Oct. 31, 2012   67,448,000       1,200,000