SENIOR LONG-TERM DEBT (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended																									12 Months Ended								3 Months Ended	12 Months Ended	9 Months Ended	3 Months Ended									0 Months Ended		12 Months Ended						12 Months Ended			12 Months Ended			3 Months Ended	12 Months Ended				1 Months Ended
	May 25, 2014	May 25, 2014	May 26, 2013	May 27, 2012	May 25, 2014 5.875% Senior Debt Due April 2014	May 26, 2013 5.875% Senior Debt Due April 2014	May 25, 2014 1.35% Senior Debt Due September 2015	May 26, 2013 1.35% Senior Debt Due September 2015	Nov. 25, 2012 1.35% Senior Debt Due September 2015	May 25, 2014 2.1% Senior Debt Due March 2018	May 26, 2013 2.1% Senior Debt Due March 2018	Nov. 25, 2012 2.1% Senior Debt Due March 2018	May 25, 2014 3.25% Senior Debt Due September 2022	May 26, 2013 3.25% Senior Debt Due September 2022	Nov. 25, 2012 3.25% Senior Debt Due September 2022	May 25, 2014 Unsecured Debt	Feb. 24, 2013 Unsecured Debt	May 25, 2014 1.3% Senior Debt Due January 2016	May 26, 2013 1.3% Senior Debt Due January 2016	Feb. 24, 2013 1.3% Senior Debt Due January 2016	May 25, 2014 1.9% Senior Debt Due January 2018	May 26, 2013 1.9% Senior Debt Due January 2018	Feb. 24, 2013 1.9% Senior Debt Due January 2018	May 25, 2014 3.2% Senior Debt Due January 2023	May 26, 2013 3.2% Senior Debt Due January 2023	Feb. 24, 2013 3.2% Senior Debt Due January 2023	May 25, 2014 4.65% Senior Debt Due January 2043	May 26, 2013 4.65% Senior Debt Due January 2043	Feb. 24, 2013 4.65% Senior Debt Due January 2043	May 25, 2014 4.95% Senior Debt Due August 2020 (Including Ralcorp Senior Notes)	May 26, 2013 4.95% Senior Debt Due August 2020 (Including Ralcorp Senior Notes)	May 25, 2014 6.625% Senior Debt Due August 2039 (Including Ralcorp Senior Notes)	May 26, 2013 6.625% Senior Debt Due August 2039 (Including Ralcorp Senior Notes)	May 25, 2014 Ralcorp Notes	Feb. 24, 2013 Term Facility Agreement	May 25, 2014 Term Facility Agreement	Feb. 24, 2013 Base Rate Term Facility Agreement	Feb. 24, 2013 Ralcorp	Feb. 24, 2013 Ralcorp	Feb. 24, 2013 Ralcorp Secured Debt	May 25, 2014 Ralcorp 4.95% Ralcorp Senior Notes	May 25, 2014 Ralcorp 6.625% Senior Notes Ralcorp Due August 2019	May 25, 2014 Ralcorp Ralcorp Notes	Feb. 24, 2013 Ralcorp 7.29% Senior Notes Due August 2018 Issued by Ralcorp	Feb. 24, 2013 Ralcorp 7.39% Senior Notes Due August 2020 Issued by Ralcorp	Feb. 24, 2013 Ralcorp 7.29% Senior Notes Due August 2018 Issued by Ralcorp, Ralcorp Discharged Notes	Feb. 27, 2013 Ralcorp Ralcorp Callable Notes	May 25, 2014 Ralcorp Ralcorp Callable Notes	May 27, 2012 Six Point Seven Five Percent Senior Notes Due September Twenty Eleven	Feb. 24, 2013 Unsecured Debt	Nov. 25, 2012 Unsecured Debt	Nov. 25, 2012 Unsecured Debt Tranche One	Nov. 25, 2012 Unsecured Debt Tranche Two	Nov. 25, 2012 Unsecured Debt Tranche Three	May 25, 2014 Unsecured Debt Ralcorp Notes	May 26, 2013 Unsecured Debt Ralcorp Notes	Feb. 24, 2013 Unsecured Debt Ralcorp	May 25, 2014 Revolving Credit Facility	May 25, 2014 Revolving Credit Facility Base Rate	May 25, 2014 2014 Interest Rate Swap [Member]	Feb. 27, 2011 2010 Interest Rate Swap [Member]	May 25, 2014 2010 Interest Rate Swap [Member]	May 26, 2013 2010 Interest Rate Swap [Member]	May 27, 2012 2010 Interest Rate Swap [Member]	Jul. 31, 2014 Subsequent Event [Member]	Jul. 31, 2014 Subsequent Event [Member] Term Facility Agreement	Jun. 30, 2014 Subsequent Event [Member] Term Facility Agreement
Debt Instrument [Line Items]
Interest rate at period end																																			1.902%
Senior notes	$ 8,737,100,000	$ 8,737,100,000	$ 9,292,200,000		$ 0	$ 500,000,000	$ 250,000,000	$ 250,000,000		$ 250,000,000	$ 250,000,000		$ 250,000,000	$ 250,000,000				$ 750,000,000	$ 750,000,000	$ 750,000,000	$ 1,000,000,000	$ 1,000,000,000	$ 1,000,000,000	$ 1,225,000,000	$ 1,225,000,000	$ 1,225,000,000	$ 937,000,000	$ 1,000,000,000	$ 1,000,000,000	$ 300,000,000	$ 300,000,000	$ 450,000,000	$ 450,000,000	$ 33,900,000						$ 460,700,000	$ 33,900,000	$ 17,200,000	$ 16,700,000		$ 664,500,000	$ 33,000,000		$ 460,700,000				$ 250,000,000	$ 250,000,000	$ 250,000,000
Effective percentage																																										2.83%	4.82%
New term loan facility																																			1,500,000,000
Long-term Debt, Gross																716,000,000	716,000,000																																	3,975,000,000	750,000,000						631,500,000
Repurchase amount																																														44,800,000
Extinguishment of debt charge																																				600,000,000											562,500,000																			550,000,000	350,000,000
Unsecured debt																																			1,500,000,000
Gains (Losses) on Extinguishment of Debt		3,700,000																																		(6,200,000)			(1,300,000)
Term loan repayment percent																																			2.50%
Interest rate on borrowings		2.00%																																			1.75%																						1.30%
Interest capitalized		0	(56,600,000)	0																																		52,100,000
Debt issuance costs																																						27,300,000
Fair value adjustment	163,800,000	163,800,000
Repayments of long-term debt	500,000,000	569,200,000	2,074,000,000	363,600,000																							63,000,000																						342,700,000
Interest rate	3.25%	3.25%			5.875%		1.35%		1.35%	2.10%		2.10%	3.25%		3.25%			1.30%		1.30%	1.90%		1.90%	3.20%		3.20%	4.65%		4.65%	4.95%		6.625%									4.95%	6.625%		7.29%	7.39%				6.75%
Percentage of consolidated capital base if exceeded by funded debt than repay borrowings																																																										70.00%
Fixed charges coverage if range in than repay Borrowings as per multi year revolving credit facility																																																										1.75
Increase (Decrease) In Interest Expense, Net																																																							(7,100,000)	(2,200,000)
Interest paid		395,700,000	215,600,000	211,900,000
Reduction of net interest expense due to impact of interest rate swap contracts																																																												4,100,000		8,600,000	9,200,000	9,900,000
Proceeds from termination of interest rate swap contract																																																													31,500,000
Short-term Debt	$ 137,000,000	$ 137,000,000	$ 185,000,000																																																														$ 330,000,000