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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 |

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