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SHARE-BASED AWARDS AND OPTIONS - Restricted, Performance and Leveraged Units Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
7 Months Ended 12 Months Ended
Dec. 31, 2016
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 $ 18,707 $ 30,809 $ 21,056 $ 29,793
Leveraged Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award performance period     3 years  
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) 1,606 1,848 1,754 2,192
Granted (in shares) 348 461 954 1,088
Vested (in shares) (639) (633) (648) (1,286)
Forfeited (in shares) (52) (70) (212) (240)
Nonvested, end of period (in shares) 1,263 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) $ 37.25 $ 28.97 $ 22.72 $ 22.00
Granted, Weighted Average Grant-Date Fair Value (in dollars per share) 74.26 57.04 36.21 23.55
Vested, Weighted Average Grant-Date Fair Value (in dollars per share) 31.38 27.55 23.17 22.31
Forfeited, Weighted Average Grant-Date Fair Value (in dollars per share) 45.27 34.69 27.03 22.40
Nonvested, Weighted Average Grant-Date Fair Value, end of period (in dollars per share) $ 49.55 $ 37.25 $ 28.97 $ 22.72
Total fair value of share awards vested in period $ 20,000 $ 17,400 $ 15,000 $ 28,700
Share-based compensation expense 17,200 $ 28,800 $ 19,800 $ 28,200
Total unrecognized compensation cost $ 45,500      
Total unrecognized compensation cost, weighted average period (in years) 2 years 11 days      
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%
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  
Share-based Compensation Award, Number of Tranches | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   28 months    
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    
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%