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VARIABLE INTEREST ENTITIES (Narrative) (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Feb. 28, 2016 | May. 31, 2015
Variable Interest Entity [Line Items] |  |
Price at which Ochoa has the right to put its equity interest | $ 46,400,000 |
Loss on lease put option |  |
Variable Interest Entity [Line Items] |  |
Estimate of possible loss | 58,500,000 |
Accrued put cost | $ 7,500,000 |
Lamb Weston BSW |  |
Variable Interest Entity [Line Items] |  |
Ownership interest (as a percent) | 49.99% |
Balance of promissory note due from joint venture | $ 36,100,000 |
Maximum line of credit | $ 15,000,000.0 |
Lamb Weston RDO |  |
Variable Interest Entity [Line Items] |  |
Ownership interest (as a percent) | 50.00% |
Balance of investment | $ 16,000,000 | $ 14,600,000
Owners' equity in capital structure of variable interest entity | 32,100,000 |
Term borrowings from banks | $ 41,100,000 |

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