VARIABLE INTEREST ENTITIES (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Feb. 28, 2016	May 29, 2016	May 31, 2015
Variable Interest Entity [Line Items]
Contingent put options general exercise period		30 days
Accrued put cost		$ 108,900,000	$ 0
Lamb Weston BSW
Variable Interest Entity [Line Items]
Basis points borrowing under the lines of credit		2.00%
Acquisition of equity interest in Lamb Weston		49.99%
Price at which Ochoa has the right to put its equity interest		$ 47,400,000
Balance of promissory note due from joint venture		36,100,000
Line of credit with Lamb Weston BSW, maximum borrowing capacity		$ 15,000,000
Lamb Weston RDO
Variable Interest Entity [Line Items]
Acquisition of equity interest in Lamb Weston		50.00%
Investment in Lamb Weston, maximum exposure		$ 16,900,000	$ 14,600,000
Owners' equity in capital structure of variable interest entity		33,900,000
Term borrowings from banks in capital structure of Lamb Weston, RDO		41,100,000
2032 Maturity | Lamb Weston BSW | Promissory Note
Variable Interest Entity [Line Items]
Debt Instrument, Face Amount	$ 30,000,000
2032 Maturity | Lamb Weston BSW | Fixed Rate Promissory Note
Variable Interest Entity [Line Items]
Interest rate	4.34%
Debt Instrument, Face Amount	$ 23,000,000
2032 Maturity | Lamb Weston BSW | Variable Rate Promissory Note
Variable Interest Entity [Line Items]
Debt Instrument, Face Amount	$ 7,000,000
LIBOR | Minimum | 2032 Maturity | Lamb Weston BSW | Variable Rate Promissory Note
Variable Interest Entity [Line Items]
Basis points borrowing under the lines of credit	1.90%
LIBOR | Maximum | 2032 Maturity | Lamb Weston BSW | Variable Rate Promissory Note
Variable Interest Entity [Line Items]
Basis points borrowing under the lines of credit	2.30%
Revolving Credit Facility
Variable Interest Entity [Line Items]
Line of credit facility, amount outstanding		0
Revolving Credit Facility | Lamb Weston BSW
Variable Interest Entity [Line Items]
Debt Instrument, Face Amount	$ 10,000,000
Line of credit facility, amount outstanding		$ 1,000,000
Revolving Credit Facility | LIBOR
Variable Interest Entity [Line Items]
Basis points borrowing under the lines of credit		1.25%
Revolving Credit Facility | LIBOR | Minimum | Lamb Weston BSW
Variable Interest Entity [Line Items]
Basis points borrowing under the lines of credit	1.75%
Revolving Credit Facility | LIBOR | Maximum | Lamb Weston BSW
Variable Interest Entity [Line Items]
Basis points borrowing under the lines of credit	2.00%
Loss on Lease Put Option
Variable Interest Entity [Line Items]
Estimate of possible loss		$ 58,500,000
Accrued put cost		$ 9,300,000