RESTRUCTURING (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	7 Months Ended	3 Months Ended	7 Months Ended	3 Months Ended	7 Months Ended	3 Months Ended	12 Months Ended									3 Months Ended	12 Months Ended
	Aug. 25, 2013 Ralcorp Restructuring	Aug. 25, 2013 Ralcorp Restructuring	Aug. 25, 2013 Consumer Foods Ralcorp Restructuring	Aug. 25, 2013 Consumer Foods Ralcorp Restructuring	Aug. 25, 2013 Corporate Ralcorp Restructuring	Aug. 25, 2013 Corporate Ralcorp Restructuring	Aug. 25, 2013 Ralcorp Pre-acquisition Restructuring	May 26, 2013 Network Optimization Plan	May 26, 2013 Network Optimization Plan Consumer Foods	May 26, 2013 Network Optimization Plan Commercial Foods	May 26, 2013 Network Optimization Plan Corporate	May 26, 2013 Administrative Efficiency Restructuring Plan	May 26, 2013 Administrative Efficiency Restructuring Plan Consumer Foods	May 26, 2013 Administrative Efficiency Restructuring Plan Commercial Foods	May 26, 2013 Administrative Efficiency Restructuring Plan Corporate	May 26, 2013 Acquisition Related Restructuring	Aug. 25, 2013 Acquisition Related Restructuring Consumer Foods	May 26, 2013 Acquisition Related Restructuring Consumer Foods	May 26, 2013 Acquisition Related Restructuring Corporate
Restructuring Cost and Reserve [Line Items]
Restructured and related cost incurred to date							$ 2.6	$ 76.7	$ 59.9	$ 16.0	$ 0.8	$ 18.7	$ 13.8	$ 1.0	$ 3.9	$ 14.9		$ 12.4	$ 2.5
Restructuring and related cost, incurred cost	7.3	35.7	0.3	0.3	7.0	35.4	1.3										0.9
Restructuring and related cost, expected cost							$ 3.7