DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Narrative) (Details) $ in Millions		3 Months Ended			12 Months Ended
	May. 29, 2014 USD ($)	Aug. 30, 2015 USD ($)	Aug. 24, 2014 USD ($)	May. 25, 2014 USD ($) facility	May. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax asset impairment charge		$ 0.6	$ 1.3
Income from operations of discontinued operations before income taxes		0.0	(626.5)
Selling, general and administrative expenses		405.4	393.8
Private Brands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax asset impairment charge		1,810.0
After-tax asset impairment charges		1,340.0
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					$ 379.6
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		2.9	$ 3.8
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		$ 732.7
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