LONG-TERM DEBT (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Nov. 24, 2013	Nov. 25, 2012	Nov. 27, 2010	Nov. 24, 2013	Nov. 25, 2012
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 43.0			$ 50.7	$ 34.2
Reduction of net interest expense due to impact of interest rate swap contracts	2.4	2.3		4.7	4.5
Proceeds from termination of interest rate swap contract			31.5
Gains (Losses) on Extinguishment of Debt	2.4
Unsecured Debt | Ralcorp Notes
Debt Instrument [Line Items]
Senior unsecured notes	716.0			716.0
Senior notes	33.9			33.9
Debt fair value adjustment				163.8
Amortization fair value adjustment	$ 1.8			$ 3.4