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PENSION AND POSTRETIREMENT BENEFITS - Schedule of the Effect of a One Percentage Point Change in Assumed Health Care Cost Rates (Details)
$ in Millions
12 Months Ended
May 28, 2017
USD ($)
One Percent Increase  
Effect on total service and interest cost $ 0.4
Effect on postretirement benefit obligation 8.1
One Percent Decrease  
Effect on total service and interest cost (0.3)
Effect on postretirement benefit obligation $ (7.3)