LONG-TERM DEBT AND REVOLVING CREDIT FACILITY (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Aug. 24, 2014	Feb. 28, 2016	Feb. 22, 2015	Sep. 21, 2015
Debt Instrument [Line Items]
Principal balance repaid				$ 2,521,400,000	$ 1,491,200,000
Loss on early retirement of debt	$ 23,900,000		$ 16,300,000	23,900,000	24,600,000
Proceeds from issuance of debt	600,000,000
2014 Interest rate swap
Debt Instrument [Line Items]
Reduction of net interest expense due to impact of interest rate swap contracts		$ 1,900,000			$ 7,100,000
Interest rate contracts
Debt Instrument [Line Items]
Reduction of net interest expense due to impact of interest rate swap contracts	500,000			1,700,000
Cumulative adjustment to the fair value of the debt instruments that were hedged				$ 12,600,000
Gain on derivative portion written off related to tender offers	3,000,000
Tender premium
Debt Instrument [Line Items]
Loss on early retirement of debt	109,500,000		9,500,000
Floating rate notes due July 2016
Debt Instrument [Line Items]
Aggregate principal amount			$ 550,000,000
Floating rate notes due July 2016 | LIBOR
Debt Instrument [Line Items]
Long-term debt interest rate (as a percent)			0.37%
Senior notes | 2015 Maturity
Debt Instrument [Line Items]
Principal balance repaid	$ 250,000,000
Stated interest rate (as a percent)	1.35%			1.35%
Senior notes | 2023 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount	$ 163,000,000		$ 225,000,000	$ 163,000,000
Senior notes | 2016 Maturity
Debt Instrument [Line Items]
Stated interest rate (as a percent)	1.30%			1.30%
Repayments of senior debt	$ 750,000,000
Senior notes | 2043 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount	560,300,000		200,000,000	$ 560,300,000
Senior notes | 2039 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount	341,800,000			341,800,000
Senior notes | 2019 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount	139,900,000		25,000,000	139,900,000
Senior notes | 2026 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount	110,000,000			110,000,000
Senior notes | 2020 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount	85,000,000			85,000,000
Senior notes | 2018 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount			25,000,000
Senior notes | 2017 Maturity
Debt Instrument [Line Items]
Repurchased aggregate principal amount			25,000,000
Term Loan Facility | LIBOR
Debt Instrument [Line Items]
Principal balance repaid			900,000,000
Loss on early retirement of debt			$ 8,300,000
Long-term debt interest rate (as a percent)			1.75%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 1,500,000,000.0
Lamb Weston BSW
Debt Instrument [Line Items]
Aggregate principal amount	7,000,000			7,000,000
Lamb Weston BSW | Promissory note | 2032 Maturity
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000			$ 30,000,000
Lamb Weston BSW | Fixed rate promissory note | 2032 Maturity
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.34%			4.34%
Aggregate principal amount	$ 23,000,000			$ 23,000,000
Minimum | Lamb Weston BSW | Variable rate promissory note | 2032 Maturity | LIBOR
Debt Instrument [Line Items]
Long-term debt interest rate (as a percent)	1.90%
Maximum | Lamb Weston BSW | Variable rate promissory note | 2032 Maturity | LIBOR
Debt Instrument [Line Items]
Long-term debt interest rate (as a percent)	2.30%