DISCONTINUED OPERATIONS AND OTHER DIVESTITURES - Private Brands Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	May 29, 2016	Feb. 28, 2016	May 28, 2017	May 29, 2016	May 31, 2015	Feb. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax charge to write-down goodwill and long-lived assets						$ 343.3	$ 62.6	$ 36.0
Loss on extinguishment of debt					$ 23.9	93.3	23.9	24.6
Deferred tax asset on capital loss of investment	$ 1,649.7			$ 2,302.5		1,649.7	2,302.5
Valuation allowance released						420.1	(1,400.0)	1.9
Impairment of goodwill						198.9
Senior notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on extinguishment of debt		$ 32.7
Ralcorp
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate principal amount of senior notes repaid					$ 33.9		33.9
Loss on extinguishment of debt							5.4
Ralcorp | Senior notes | Senior notes due August 15, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate principal amount of senior notes repaid							$ 17.2
Stated interest rate				4.95%			4.95%
Effective interest rate				2.83%			2.83%
Ralcorp | Senior notes | Senior notes due August 15, 2039
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate principal amount of senior notes repaid							$ 16.7
Stated interest rate				6.625%			6.625%
Effective interest rate				4.82%			4.82%
Private Brands | Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from disposition on a debt-free basis									$ 2,600.0
Income tax benefit						0.3	$ 593.1	128.1
Impairment of goodwill								1,510.0
Impairment charges								57.6
Private Brands | Held for sale, discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax charge to write-down goodwill and long-lived assets							1,920.0
After-tax charge to write-down goodwill and long-lived assets							1,440.0
Deferred tax asset on capital loss of investment				$ 1,540.0			1,540.0
Income tax benefit							20.7
Spicetec and JM Swank | Held for sale, not discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Valuation allowance released				$ 147.3
Lamb Weston | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit						(87.5)	$ (178.9)	$ (149.3)
Valuation allowance released			$ 150.4			$ 150.4
Wesson | Held for sale, not discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Valuation allowance released	$ 91.3