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CONTINGENCIES (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 27, 2014 USD ($) defendant | Aug. 30, 2015 USD ($) site | Nov. 23, 2014 USD ($) | Aug. 24, 2014 USD ($) | May. 25, 2014 USD ($) | May. 26, 2013 USD ($) | May. 27, 2012 USD ($) | May. 31, 2015 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Face value of federal income tax credits |  | $ 26.7 |  |  |  |  |  |
Accrual reduction |  |  | $ 1.2 | $ 5.8 | $ 6.7 |  |  |
Liabilities |  | $ 12,389.9 |  |  |  |  |  | $ 12,932.2
Contingent put options general exercise period |  | 30 days |  |  |  |  |  |
Litigation matter |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Dispute coverage charge with insurance carrier |  |  |  |  |  | $ 7.5 | $ 17.5 |
Beatrice |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Number of sites under environmental matters for which acquired company has a liability | site |  | 37 |  |  |  |  |  |
Number of sites under environmental matters for which acquired company is making payments | site |  | 33 |  |  |  |  |  |
Reserves for Beatrice environmental matters |  | $ 54.0 |  |  |  |  |  |
Maximum period expected for disbursements on environmental matters |  | 18 years |  |  |  |  |  |
Potato supply agreement guarantee |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Amount of supplier loans effectively guaranteed |  | $ 58.5 |  |  |  |  |  |
Loss on lease put option |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Estimate of possible loss |  | 103.0 |  |  |  |  |  |
Accrued put cost |  | 5.7 |  |  |  |  |  |
Pending litigation |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Estimate of possible loss |  | $ 11.2 |  |  |  |  |  |
California | Beatrice |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Other defendants | defendant | 2 |  |  |  |  |  |  |
Expected decision from court | $ 1,150.0 |  |  |  |  |  |  |
Lamb-Weston/Meijer, V.O.F. |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |
Ownership interest (as percent) |  | 50.00% |  |  |  |  |  |
Liabilities |  | $ 112.4 |  |  |  |  |  | 129.1
Partners' capital |  | $ 270.4 |  |  |  |  |  | $ 255.9

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