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Consolidated Statement of Equity - 3 months ended Aug. 31, 2018 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning Balance at May. 31, 2018 $ 560,175 $ 8,278 $ 202,572 $ (9,746) $ 359,071
Beginning Balance (in shares) at May. 31, 2018 51,735,732 51,736,000      
Issuance of shares under share-based compensation plan $ 8,473 $ 40 8,433    
Issuance of shares under share-based compensation plan (in shares)   251,000      
Issuance of shares under employee stock purchase plan 519 $ 2 517    
Issuance of shares under employee stock purchase plan (in shares)   8,000      
Net Income 15,237       15,237
Other comprehensive (loss) (2,778)     (2,778)  
Ending Balance at Aug. 31, 2018 $ 581,626 $ 8,320 $ 211,522 $ (12,524) $ 374,308
Ending Balance (in shares) at Aug. 31, 2018 51,995,349 51,995,000