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Consolidated Statement of Equity - 9 months ended Feb. 28, 2017 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Non-controlling Interest
Beginning Balance at May. 31, 2016 $ 404,161 $ 6,011 $ 150,000 $ (3,946) $ 252,133 $ (37)
Beginning Balance (in shares) at May. 31, 2016 37,567,689 37,567,689        
Issuance of shares under share-based compensation plan and $3,671 income tax benefit (in shares)   533,000        
Issuance of shares under share-based compensation plan and $3,671 income tax benefit $ 18,830 $ 85 18,745      
Issuance of shares under employee stock purchase plan (in shares)   18,000        
Issuance of shares under employee stock purchase plan 925 $ 3 922      
Net income 31,483       31,320 163
Other comprehensive loss (3,743)     (3,743)    
Ending Balance at Feb. 28, 2017 $ 451,656 $ 6,099 $ 169,667 $ (7,689) $ 283,453 $ 126
Ending Balance (in shares) at Feb. 28, 2017 38,119,486 38,119,000