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SHARE-BASED PAYMENTS - Performance-Based Share Plan (Narrative) (Details) - Performance Shares - USD ($)
$ in Millions
12 Months Ended
May 28, 2017
May 29, 2016
May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 13.3 $ 14.2 $ 5.7
Tax benefit 5.1 5.4 2.2
Total intrinsic value of share units vested 2.8 $ 12.7 $ 13.9
Unrecognized compensation expense, net of estimated forfeitures, related to performance shares $ 10.4    
Weighted average period for recognition 1 year 8 months 6 days    
2018 performance period | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting (as a percent) 33.33%    
2018 performance period | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting (as a percent) 33.33%    
2018 performance period | Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting (as a percent) 33.33%    
2019 performance period | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting (as a percent) 33.33%    
2019 performance period | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting (as a percent) 66.66%