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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 29, 2015 | Nov. 23, 2014 | Feb. 24, 2013 | Nov. 29, 2015 | Nov. 23, 2014 | May. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Hedge for anticipated consumption of commodity inputs, period (up to) |  |  |  | 36 months |  |
Unamortized amounts of deferred gain (loss) | $ (378.1) |  |  | $ (378.1) |  | $ (329.5)
Derivative asset prior to offsetting to total derivative | 18.1 |  |  | 18.1 |  | 7.3
Derivative liability prior to offsetting to total derivative | 25.6 |  |  | 25.6 |  | 13.2
Maximum amount of loss due to the credit risk of the counterparties | 24.0 |  |  | 24.0 |  |
Open commodity purchase contracts |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional value of open commodity contracts | 272.7 |  |  | 272.7 |  | 554.9
Open commodity sales contracts |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional value of open commodity contracts | 196.2 |  |  | 196.2 |  | 393.1
Prepaid expenses and other current assets |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Amounts representing a right to reclaim cash collateral | 7.5 |  |  | 7.5 |  | 5.9
Interest rate contracts |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net gain | 0.6 |  |  | 1.2 |  |
Foreign exchange contracts |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional value of open commodity contracts | 91.8 |  |  | 91.8 |  | $ 108.6
Cash flow hedging | 2043 Maturity |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Deferred gain (loss) on derivative |  |  | $ 4.2 |  |  |
Cash flow hedging | 2043 Maturity | Cash flow hedges |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Unamortized amounts of deferred gain (loss) | 3.0 |  |  | 3.0 |  |
Cash flow hedging | 2023 Maturity |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Deferred gain (loss) on derivative |  |  | $ (2.0) |  |  |
Cash flow hedging | 2023 Maturity | Cash flow hedges |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Unamortized amounts of deferred gain (loss) | (1.3) |  |  | (1.3) |  |
Fair value hedging |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Loss on change of fair value of senior long-term debt |  | $ 2.6 |  |  | $ 0.1 |
Fair value hedging | Selling, general and administrative expense |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net gain |  | 0.3 |  |  | 0.6 |
Fair value hedging | Interest rate contracts |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain on change in fair value of interest rate swap contracts |  | $ 2.9 |  |  | $ 0.7 |
Cumulative adjustment to fair value of hedged debt instruments | 12.6 |  |  | 12.6 |  |
Unamortized amount of deferred gain on debt instruments hedged | $ 10.6 |  |  | $ 10.6 |  |

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