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SHARE-BASED PAYMENTS - Performance-Based Share Plan (Narrative) (Details) - Performance Shares - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Feb. 25, 2018
May 27, 2018
May 28, 2017
May 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense   $ 11.8 $ 13.3 $ 14.2
Tax benefit   3.9 5.1 5.4
Total intrinsic value of share units vested   11.2 $ 2.8 $ 12.7
Unrecognized compensation expense, net of estimated forfeitures, related to performance shares   $ 15.6    
Weighted average period for recognition   1 year 9 months 6 days    
August 28, 2016 award | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent)   33.33%    
August 28, 2016 award | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent)   33.33%    
August 28, 2016 award | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent)   33.33%    
August 28, 2017 award | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent)   33.33%    
August 28, 2017 award | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent)   66.66%    
Performance period ending in 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Performance period ending in 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Diluted EPS CAGR measurement period 2 years      
Award vesting period 3 years      
Performance period ending in 2020        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years