XML 23 R78.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stockholders' Equity (Details Textual) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
May 31, 2014
OptionPlan
May 31, 2013
May 31, 2012
Oct. 05, 2011
Feb. 27, 2004
May 22, 2012
Avista Capital Partners [Member]
May 31, 2014
Avista Capital Partners [Member]
May 31, 2014
Performance Share and Restricted Stock Unit Awards [Member]
May 31, 2013
Performance Share and Restricted Stock Unit Awards [Member]
May 31, 2012
Performance Share and Restricted Stock Unit Awards [Member]
May 31, 2014
1997 Stock Option Plan [Member]
Oct. 05, 2011
2004 Stock and Incentive Award Plan [Member]
May 31, 2014
2004 Stock and Incentive Award Plan [Member]
May 31, 2014
2004 Stock and Incentive Award Plan [Member]
Maximum [Member]
May 31, 2014
Employee Stock Purchase Plan [Member]
Employees
May 31, 2013
Employee Stock Purchase Plan [Member]
May 31, 2012
Employee Stock Purchase Plan [Member]
Other Ownership Interests [Line Items]                                  
Authorized capital stock         50,000,000                        
Shares of common stock 45,000,000 45,000,000     45,000,000                        
Common stock, par value $ 0.01 $ 0.01     $ 0.01                        
Preferred stock, shares authorized 5,000,000 5,000,000     5,000,000                        
Preferred stock, par value $ 0.01 $ 0.01     $ 0.01                        
Voting common stock, par value         $ 1                        
Non-voting common stock, par value         $ 1                        
Common stock, issued         9,200                        
Common stock, shares outstanding         9,200,000                        
Issuance of investment funds           9,500,000                      
Common stock, outstanding shares, percentage             27.00%                    
Authorized the repurchase of common stock       $ 20,000,000                          
Number of purchased shares 0 0 142,305                            
Purchase of common stock for treasury     (2,104,000)                            
Stock-based compensation plans 2                                
Maximum number of shares to be offered 5,800,000                           1,200,000    
Total number of common stock available to be issued                     1,497,674   1,600,000 800,000 423,895    
Options exercisable period                     10 years   10 years        
Total number of common stock reserved for issuance                         5,750,000        
Incentive award plan to increase the minimum number of shares                       200,000          
Incentive award plan to increase the maximum number of shares                       500,000          
Percentage of grants to employees vesting 25.00%                                
Option grants to employees vesting period 4 years                                
Percentage of grants for consultants vesting 100.00%                                
Option grants to consultants vesting period 1 year                                
Percentage of Initial grants to directors vesting 25.00%                                
Initial grants to directors vesting period 4 years                                
Subsequent grants for directors vesting 33.33%                                
Subsequent grants for directors vesting period 3 years                                
The total intrinsic value of options exercised 1,000,000 100,000 2,200,000                            
Total fair value of restricted stock awards vesting               1,800,000 1,200,000 900,000              
Unrecognized compensation cost for stock options 12.00%                                
Share purchase periods                             2    
Duration of purchase of shares                             6 months    
Employee eligible in participating in offering period                             6 months    
Working schedule of employee to participate in offering period                             20 or more hours per week and more than five months in a calendar year    
Employees ownership threshold                             5.00%    
Percentage of fair market value of a share of common stock on the first day of the offering period                             85.00%    
Percentage of fair market value of a share of common stock on the last day of the offering period                             85.00%    
Maximum number of shares to be offered under the Stock Purchase Plan                             146,275 123,556 103,362
Average price of share issued $ 9.30 $ 9.80 $ 11.62                            
Stock based compensation pre tax amount 5,422,000 4,609,000 4,090,000                            
Stock based compensation after tax amount $ 3,765,000 $ 3,069,000 $ 2,704,000