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Consolidated Statement of Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Non-controlling Interest
Beginning Balance at May. 31, 2013 $ 258,287 $ 5,773 $ 99,935 $ (1,372) $ 153,885 $ 66
Beginning Balance (in shares) at May. 31, 2013 36,084,021 36,084        
Issuance of shares of common stock under equity compensation plans, and share based compensation (in shares)   542        
Issuance of shares of common stock under equity compensation plans, and share based compensation 10,035 86 9,949      
Issuance of shares under employee stock purchase plan (in shares)   18        
Issuance of shares under employee stock purchase plan 616 3 613      
Comprehensive income:            
Net income (loss) for the nine months ended February 28, 2014 20,478       20,621 (143)
Foreign currency translation adjustments 1,708     1,708    
Ending Balance at Feb. 28, 2014 $ 291,124 $ 5,862 $ 110,497 $ 336 $ 174,506 $ (77)
Ending Balance (in shares) at Feb. 28, 2014 36,643,516 36,644