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Consolidated Statement of Equity - 6 months ended Nov. 30, 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 $ 12,580 $ 54 12,526    
Issuance of shares under share-based compensation plan (in shares)   338,000      
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 31,288       31,288
Other comprehensive (loss) (2,488)     (2,488)  
Ending Balance at Nov. 30, 2018 $ 602,074 $ 8,334 $ 215,615 $ (12,234) $ 390,359
Ending Balance (in shares) at Nov. 30, 2018 52,081,876 52,082,000