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Consolidated Statement of Equity - 6 months ended Nov. 30, 2015 - 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)   307,000        
Issuance of shares of common stock under equity compensation plans, and share based compensation 9,155 $ 49 9,106      
Issuance of shares under employee stock purchase plan (in shares)   9,000        
Issuance of shares under employee stock purchase plan 360 $ 1 359      
Comprehensive income:            
Net income for the six months ended November 30, 2015 18,431       18,396 35
Other comprehensive loss $ (1,007)     (1,007)    
Ending Balance (in shares) at Nov. 30, 2015 37,443,771 37,444,000        
Ending Balance at Nov. 30, 2015 $ 377,902 $ 5,991 $ 141,371 $ (3,449) $ 233,965 $ 24