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SHARE-BASED AWARDS AND OPTIONS - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Share-based compensation expense $ 30,809 $ 21,056 $ 29,793
Total Shareholder Return Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award performance period   3 years  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested, beginning of period (in shares) 1,848 1,754  
Granted (in shares) 461 954  
Vested (in shares) (633) (648)  
Forfeited (in shares) (70) (212)  
Nonvested, end of period (in shares) 1,606 1,848 1,754
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested, Weighted Average Grant-Date Fair Value, beginning of period (in dollars per share) $ 28.97 $ 22.72  
Granted, Weighted Average Grant-Date Fair Value (in dollars per share) 57.04 36.21  
Vested, Weighted Average Grant-Date Fair Value (in dollars per share) 27.55 23.17  
Forfeited, Weighted Average Grant-Date Fair Value (in dollars per share) 34.69 27.03  
Nonvested, Weighted Average Grant-Date Fair Value, end of period (in dollars per share) $ 37.25 $ 28.97 $ 22.72
Total fair value of share awards vested in period $ 17,400 $ 15,000 $ 28,700
Share-based compensation expense 28,800 $ 19,800 $ 28,200
Total unrecognized compensation cost $ 42,600    
Total unrecognized compensation cost, weighted average period (in years) 1 year 10 months 24 days    
Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     1 year
Leveraged Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award performance period   3 years  
Maximum | Total Shareholder Return Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target shares of company stock (up to)   200.00%  
Maximum | Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target shares of company stock (up to) 200.00%    
Share-based Compensation Award, Number of Tranches | Restricted Stock and Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years 4 years  
One Year Increment | Restricted Stock and Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
One Year Increment | Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of award vesting rights     25.00%
Three Year Equal Vesting | Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of award vesting rights     75.00%
Year One | Leveraged Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of award vesting rights 33.33%    
Year Two | Leveraged Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of award vesting rights 33.33%    
Year Three | Leveraged Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of award vesting rights 33.33%