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PENSION AND POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 30, 2015 | Aug. 24, 2014
Ardent Mills |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Special termination benefits expense |  | $ 6.9
Pension Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Employer contributions to pension plan and other postretirement plan | $ 2.8 |
Further contribution to pension and other postretirement plan | 10.2 |
Postretirement Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Employer contributions to pension plan and other postretirement plan | 5.0 |
Further contribution to pension and other postretirement plan | $ 18.7 |

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition If applicable, the cost of providing special or contractual termination benefits recognized during the period on the projected benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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