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Consolidated Statement of Equity - 3 months ended Aug. 31, 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 $ 6,112 $ 176,779 $ (7,203) $ 295,926 $ 143
Beginning Balance (in shares) at May. 31, 2017 38,199,367 38,199,000        
Issuance of shares under share-based compensation plan $ 2,872 $ 4 2,868      
Issuance of shares under share-based compensation plan (in shares)   26,000        
Issuance of shares under employee stock purchase plan 485 $ 1 484      
Issuance of shares under employee stock purchase plan (in shares)   8,000        
Conversion of minority interest purchase to retained earnings         (67) 67
Net income 11,936       11,914 22
Other comprehensive income 203     203    
Ending Balance at Aug. 31, 2017 $ 487,253 $ 6,117 $ 180,131 $ (7,000) $ 307,773 $ 232
Ending Balance (in shares) at Aug. 31, 2017 38,233,260 38,233,000