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LONG-TERM DEBT (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 26, 2013 | Nov. 28, 2010 | May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Debt Instrument [Line Items] |  |  |  |  |
Repayments of long-term debt |  |  | $ 1,495.2 | $ 569.2 | $ 2,074.0
Gains (Losses) on Extinguishment of Debt |  |  | 16.3 | (3.7) |
Interest paid |  |  | 337.7 | 395.6 | 215.4
Senior notes |  |  | 7,801.3 | 8,736.8 |
Fair value adjustment |  |  | 163.8 |  |
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 |  |  | 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 | 9.2
Proceeds from termination of interest rate swap contract |  | $ 28.2 |  |  |
Tender Premium |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  | 9.5 |  |
4.95% Percent Senior Debt Due August 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  |  | $ 282.7 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 2.92% |  |
4.95% senior debt due August 2020 (including Ralcorp senior notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 4.95% | 4.95% |
Senior notes |  |  | $ 300.0 | $ 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 |  |
LIBOR plus 1.75% term loans due January 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 1.75% | 1.75% |
Senior notes |  |  | $ 0.0 | $ 900.0 |
LIBOR plus 0.37% term loans due July 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable |  |  | $ 550.0 |  |
Interest rate |  |  | 0.37% | 0.37% |
Senior notes |  |  | $ 550.0 | $ 0.0 |
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] |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 63.0 |
Interest rate |  |  | 4.65% | 4.65% |
Senior notes | $ 1,000.0 |  | $ 737.0 | $ 937.0 | 1,000.0
Ralcorp Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  |  | 716.0 |  |
Senior notes |  |  | 33.9 |  |
Reduction in net interest expenses |  |  | 7.8 | $ 7.1 | 2.2
Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 716.0 |  | 716.0 |  | 716.0
Term Facility Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of long-term debt |  |  | 900.0 |  |
Gains (Losses) on Extinguishment of Debt |  |  | $ 8.3 |  | 6.2
Long-term Line of Credit | 1,500.0 |  |  |  | 1,500.0
Extinguishment of Debt, Amount |  |  |  |  | 600.0
Unsecured Debt | 1,500.0 |  |  |  | $ 1,500.0
Debt Instrument, Periodic Payment, Interest Rate, Effective Percentage |  |  |  |  | 2.50%
Term Facility Agreement | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on borrowings |  |  |  |  | 1.75%
1.3% senior debt due January 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 1.30% | 1.30% |
Senior notes |  |  | $ 750.0 | $ 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 | 1,225.0 |  | $ 1,000.0 | $ 1,225.0 | $ 1,225.0
6.625% senior debt due August 2039 (including Ralcorp senior notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 6.625% | 6.625% |
Senior notes |  |  | $ 450.0 | $ 450.0 |
6.25% Senior Debt Due August 2039 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  |  | $ 433.3 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.86% |  |
Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 3,975.0 |  | $ 3,975.0 |  | 3,975.0
Ralcorp |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  | 1.3
Ralcorp | 4.95% Ralcorp Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 4.95% |  |
Senior notes |  |  | $ 33.9 |  |
Ralcorp | 6.625% Senior Notes Ralcorp Due August 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 6.625% |  |
Senior notes |  |  | $ 17.2 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 2.83% |  |
Ralcorp | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 460.7 |  |  |  | $ 460.7
Ralcorp | Ralcorp Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  |  | $ 16.7 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.82% |  |
Ralcorp | 7.29% Senior Notes Due August 2018 Issued by Ralcorp |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 7.29% |  |  |  | 7.29%
Ralcorp | 7.39% Senior Notes Due August 2020 Issued by Ralcorp |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 7.39% |  |  |  | 7.39%
Senior notes | $ 664.5 |  |  |  | $ 664.5
Ralcorp | 7.29% Senior Notes Due August 2018 Issued by Ralcorp, Ralcorp Discharged Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | 33.0 |  |  |  | 33.0
Debt Instrument, Repurchase Amount | 44.8 |  |  |  | 44.8
Ralcorp | Ralcorp Callable Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  |  |  | $ 460.7 |
Extinguishment of Debt, Amount | 562.5 |  |  |  |
Ralcorp | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 631.5 |  |  |  | 631.5
Ralcorp |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Cost |  |  |  |  | 52.1
Business Combination, Acquisition Related Costs |  |  |  |  | $ 27.3

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