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Consolidated Statement of Equity - 9 months ended Feb. 29, 2016 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Non-controlling Interest
Beginning Balance (in shares) at May. 31, 2015 37,128,269 37,128,000        
Beginning Balance at May. 31, 2015 $ 350,963 $ 5,941 $ 131,906 $ (2,442) $ 215,569 $ (11)
Issuance of shares of common stock under equity compensation plans, and share based compensation (in shares)   377,000        
Issuance of shares of common stock under equity compensation plans, and share based compensation 12,658 $ 60 12,598      
Issuance of shares under employee stock purchase plan (in shares)   19,000        
Issuance of shares under employee stock purchase plan 786 $ 3 783      
Comprehensive income:            
Net income for the nine months ended February 29, 2016 26,719       26,707 12
Other comprehensive loss $ (3,252)     (3,252)    
Ending Balance (in shares) at Feb. 29, 2016 37,523,740 37,524,000        
Ending Balance at Feb. 29, 2016 $ 387,874 $ 6,004 $ 145,287 $ (5,694) $ 242,276 $ 1