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LONG-TERM DEBT (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2016 | Nov. 29, 2015 | Aug. 24, 2014 | Nov. 28, 2010 | May 29, 2016 | May 31, 2015 | May 25, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | $ 2,525.0 | $ 1,493.5 | $ 569.1
(Gain) loss on extinguishment of debt | $ 23.9 |  |  |  | 23.9 | 24.6 | (4.0)
Proceeds from Issuance of Debt | 600.0 |  |  |  |  |  |
Interest paid |  |  |  |  | 323.8 | 335.4 | 393.7
Senior notes |  |  |  |  | 5,477.2 | 7,801.0 |
Fair value adjustment |  |  |  |  | 156.8 |  |
Debt Instrument, Written Off Due to Tender Offer | 94.2 |  |  |  |  |  |
2014 Interest Rate Swap |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts |  |  |  |  | 7.1 | 4.1 |
Interest Rate Swap |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts |  |  |  |  | 2.1 | 0.8 |
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion |  |  |  |  | $ 12.6 |  |
2010 Interest Rate Swap |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts |  |  |  |  |  | $ 8.6 |
Proceeds from termination of interest rate swap contract |  |  |  | $ 28.2 |  |  |
Tender Premium |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt | 109.5 |  |  |  |  |  |
4.95% Percent Senior Debt Due August 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.92% |  |
4.95% senior debt due August 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.95% | 4.95% |
Senior notes |  |  |  |  | $ 197.7 | $ 300.0 |
2023 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | 225.0 |
2043 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | 200.0 |
2019 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | 25.0 |
2018 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | 25.0 |
2017 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | 25.0 |
Senior Notes Due 2023, 2043, 2019, 2018, and 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt |  |  |  |  |  | 16.3 |
Senior Notes Due 2023, 2043, 2019, 2018, and 2017 | Tender Premium |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt |  |  |  |  |  | $ 9.5 |
LIBOR plus 1.75% term loans due January 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.75% | 1.75% |
LIBOR plus 0.37% senior notes due July 2016 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes Payable |  |  |  |  | $ 550.0 |  |
Interest rate |  |  |  |  | 0.37% | 0.37% |
Senior notes |  |  |  |  | $ 550.0 | $ 550.0 |
5.875% Senior Debt Due April 2014 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 500.0
Interest rate |  |  |  |  |  |  | 5.875%
4.65% senior debt due January 2043 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.65% | 4.65% |
Senior notes |  |  |  |  | $ 176.7 | $ 737.0 |
Ralcorp Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 716.0 |  |
Reduction in net interest expenses |  |  |  |  | $ 6.7 | $ 7.4 | $ 6.7
1.3% senior debt due January 2016 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.30% | 1.30% |
Senior notes |  |  |  |  | $ 0.0 | $ 750.0 |
1.9% senior debt due January 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.90% | 1.90% |
Senior notes |  |  |  |  | $ 1,000.0 | $ 1,000.0 |
3.2% senior debt due January 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 3.20% | 3.20% |
Senior notes |  |  |  |  | $ 837.0 | $ 1,000.0 |
6.625% senior debt due August 2039 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.625% | 6.625% |
Senior notes |  |  |  |  | $ 91.4 | $ 450.0 |
6.25% Senior Debt Due August 2039 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 4.86% |  |
Senior Notes | 2023 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 163.0 |  |  |  |  |  |
Senior Notes | 2043 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 560.3 |  |  |  |  |  |
Senior Notes | 2039 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 341.8 |  |  |  |  |  |
Senior Notes | 2019 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 139.9 |  |  |  |  |  |
Senior Notes | 2026 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 110.0 |  |  |  |  |  |
Senior Notes | 2020 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 85.0 |  |  |  |  |  |
Senior Notes | 2016 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of Senior Debt | $ 750.0 |  |  |  |  |  |
Interest rate | 1.30% |  |  |  |  |  |
Senior Notes | 2015 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 250.0 |  |  |  |  |
Interest rate |  | 1.35% |  |  |  |  |
Unsecured Debt | LIBOR plus 1.75% term loans due January 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt |  |  | $ 8.3 |  |  |  |
Debt Instrument, Face Amount |  |  | $ 900.0 |  |  |  |
Unsecured Debt | LIBOR plus 1.75% term loans due January 2018 | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings |  |  | 1.75% |  |  |  |
Ralcorp |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt | $ 5.4 |  |  |  |  |  |
Early repayment of senior debt | $ 33.9 |  |  |  |  |  |
Ralcorp | Senior Notes | 2039 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 6.625% |  |  |  |  |  |
Early repayment of senior debt | $ 16.7 |  |  |  |  |  |
Effective interest rate | 4.82% |  |  |  |  |  |
Ralcorp | Senior Notes | 2020 Maturity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 4.95% |  |  |  |  |  |
Early repayment of senior debt | $ 17.2 |  |  |  |  |  |
Effective interest rate | 2.83% |  |  |  |  |  |

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