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PENSION AND POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 28, 2016
Nov. 23, 2014
Feb. 28, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Special termination benefits expense $ 25.6    
Expense related to our expected incurrence of certain withdrawal costs 29.8    
Ardent Mills      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Special termination benefits expense   $ 6.9  
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions to pension plan and other postretirement plan 3.5   $ 9.7
Further contribution to pension and other postretirement plan     3.2
Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions to pension plan and other postretirement plan $ 3.6   12.8
Further contribution to pension and other postretirement plan     $ 10.9