XML 55 R27.htm IDEA: XBRL DOCUMENT v2.4.0.6
Employee Stock Plans (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Additional common stock for stock-based compensation awards     2,360,000  
Shares repurchased during the period 0 157,425 0 724,064
Common stock repurchased, value   $ 2,100,000   $ 10,600,000
Stock issued for stock options exercised 2,500 66,309 116,186 93,077
Warrant date issued     Jun. 30, 2002  
Warrants issued 274,207   274,207  
Common stock at an exercise price $ 11.94   $ 11.94  
Shares of common stock issued in exchange for warrants   274,207   274,207
Warrants exercised, cash       2,983,000
Stock Options And SARs [Member]
        
Total unrecognized compensation cost related to non-vested awards of stock options, SARs and Restricted Stock 2,400,000   2,400,000  
Expected cost recognized over weighted-average period     1.3  
Restricted Stock [Member]
        
Total unrecognized compensation cost related to non-vested awards of stock options, SARs and Restricted Stock 23,900,000   23,900,000  
Expected cost recognized over weighted-average period     2.2  
Shares repurchased during the period 6,292 9,044 182,950 190,991
Common stock repurchased, value 100,000 100,000 4,100,000 2,700,000
Vesting period (years) market based     three  
Vesting period minimum (years) time based     three  
Vesting period maximum (years) time based     four  
ESPP [Member]
        
Shares repurchased during the period 0 0    
Authorized payroll deductions 15.00%   15.00%  
Authorized payroll deductions, value     $ 25,000  
Fair market price of common stock     85.00%  
Maximum number of shares of common stock reserved for ESPP issuance 3,000,000   3,000,000  
Employees stock purchased     76,909 108,425
Employees stock purchased, per share value     $ 18.69 $ 11.82
Original shares reserved for issuance 1,500,000   1,500,000  
Amended shares reserved for issuance 3,000,000   3,000,000  
Shares available for future issuance     100,000