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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% |  |  |  |  |

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