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PENSION AND POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 29, 2015
Nov. 29, 2015
Nov. 23, 2014
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 $ 3.4 $ 6.2  
Further contribution to pension and other postretirement plan   6.8  
Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions to pension plan and other postretirement plan $ 4.2 9.2  
Further contribution to pension and other postretirement plan   $ 14.5