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Consolidated Statement of Equity - 6 months ended Nov. 30, 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, 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 $ 18,576 $ 90 18,486      
Issuance of shares under share-based compensation plan (in shares)   566,000        
Issuance of shares under employee stock purchase plan 485 $ 2 483      
Issuance of shares under employee stock purchase plan (in shares)   11,000        
Conversion of minority interest to retained earnings         (67) 67
Net income 29,089       29,014 75
Other comprehensive loss 737     737    
Ending Balance at Nov. 30, 2017 $ 520,644 $ 8,241 $ 193,711 $ (6,466) $ 324,873 $ 285
Ending Balance (in shares) at Nov. 30, 2017 51,508,548 51,509,000