DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Narrative) (Details) $ in Millions		3 Months Ended			6 Months Ended
	May. 29, 2014 USD ($)	Nov. 29, 2015 USD ($)	Nov. 23, 2014 USD ($)	May. 25, 2014 USD ($) facility	Nov. 29, 2015 USD ($)	Nov. 23, 2014 USD ($)	Nov. 01, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges					$ 1.7	$ 7.4
Income tax benefit		$ (5.8)	$ 3.8		466.2	(235.8)
Selling, general and administrative expenses		524.7	392.0		930.1	785.8
Ardent Mills
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash contribution	$ 49.0
Ownership interest (as percent)	44.00%
Proceeds from divestiture of business	$ 391.4
Income from operations of discontinued operations before income taxes						625.6
Income from discontinued operations, net of tax						375.9
Ardent Mills | Equity method investment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Selling, general and administrative expenses		2.8	3.5		5.7	$ 7.3
Ardent Mills | Other assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Carrying value of equity method investment		749.7			749.7
Private Brands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price							$ 2,700.0
Asset impairment charges		86.3			1,900.0
After-tax asset impairment charges		79.0			1,420.0
Deferred tax asset		1,650.0			$ 1,650.0
Income tax benefit		$ 17.0
Three small brands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill			210.9
Impairment charges			$ 30.0
Three flour milling facilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of business				$ 163.0
Flour milling facilities sold | facility				3