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CONTINGENCIES (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 27, 2014 USD ($) defendant | Nov. 23, 2014 USD ($) | Aug. 24, 2014 USD ($) | May. 25, 2014 USD ($) | Nov. 24, 2013 USD ($) | Feb. 24, 2013 USD ($) | May. 31, 2015 USD ($) site | May. 25, 2014 USD ($) | May. 26, 2013 USD ($) | May. 27, 2012 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Possible loss contingency amount |  |  |  |  |  |  | $ 11.2 |  |  |
Reserves for Beatrice environmental matters |  |  |  | $ 63.0 |  |  | 55.0 | $ 63.0 |  |
Loan purchase under agreement |  |  |  |  |  |  |  |  |  | $ 40.8
Asset impairment charges |  |  |  |  |  |  | 1,615.3 | 720.0 | $ 20.2 |
Face value of federal income tax credits |  |  |  |  |  |  | $ 26.7 |  |  |
Dispute coverage charge with insurance carrier |  |  |  |  |  |  |  |  | $ 7.5 | 17.5
Reduction to accrual |  | $ 1.2 | $ 5.8 | 6.7 |  |  |  |  |  |
Lamb Weston Meijer |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 50.00% |  |  |
Total liabilities |  |  |  | 144.7 |  |  | $ 129.1 | 144.7 |  |
Partners' equity |  |  |  | 247.0 |  |  | $ 255.9 | $ 247.0 |  |
Commercial Foods |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | $ 8.9 | $ 10.2 |  |  |  |
Gain on sale of land |  |  |  | $ 5.1 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 53.7 |  |  |
Maximum period expected for disbursements on environmental matters |  |  |  |  |  |  | 18 years |  |  |
Beatrice | CALIFORNIA |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Other defendants | defendant | 2 |  |  |  |  |  |  |  |  |
Possible loss contingency amount | $ 1,150.0 |  |  |  |  |  |  |  |  |
Potato Supply Agreement Guarantee |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of supplier loans effectively guaranteed |  |  |  |  |  |  | $ 39.3 |  |  |
Onion Supply Agreement Guarantee |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantee obligation under purchase agreement |  |  |  |  |  |  |  |  |  | $ 25.0
Leases and Other Commercial Obligations Guarantee |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantee obligation under purchase agreement |  |  |  |  |  |  | $ 2.7 |  |  |

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