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Consolidated Statement of Equity - 9 months ended Feb. 28, 2018 - 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, 2017 $ 471,757 $ 8,149 $ 174,742 $ (7,203) $ 295,926 $ 143
Beginning Balance (in shares) at May. 31, 2017 50,932,489 50,932,000        
Issuance of shares under share-based compensation plan $ 21,557 $ 101 21,456      
Issuance of shares under share-based compensation plan (in shares)   631,000        
Issuance of shares under employee stock purchase plan 1,051 $ 3 1,048      
Issuance of shares under employee stock purchase plan (in shares)   20,000        
Conversion of minority interest to retained earnings         (67) 67
Net Income 45,670       45,600 70
Other comprehensive income 1,900     1,900    
Ending Balance at Feb. 28, 2018 $ 541,935 $ 8,253 $ 197,246 $ (5,303) $ 341,459 $ 280
Ending Balance (in shares) at Feb. 28, 2018 51,583,085 51,583,000