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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 25, 2018 | May 31, 2020 | May 26, 2019 | May 27, 2018 | May 28, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Period to hedge portion of anticipated consumption of commodity inputs (up to) |  | 36 months |  |  |
Gain recognized in other comprehensive income |  | $ (7.1) | $ 45.5 | $ 2.9 |
Deferred gain in AOCI upon settlement of contracts |  | 7,950.7 | 7,463.7 | 3,756.6 | $ 4,077.8
Setoff amounts applied against total derivative assets |  | 0.4 | 0.5 |  |
Setoff amounts applied against total derivative liabilities |  | 1.5 | 0.4 |  |
Level 2 |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Maximum amount of loss due to credit risk of counterparties |  | 5.2 |  |  |
Prepaid expenses and other current assets |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts representing a right to reclaim cash collateral |  | 1.1 |  |  |
Amount representing obligation to return cash |  |  | 0.1 |  |
Cash flow hedge, Pinnacle |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain recognized in other comprehensive income | $ 47.5 |  |  |  |
Commodity contracts | Purchase contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional value of contracts |  | 102.0 | 140.1 |  |
Commodity contracts | Sales contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional value of contracts |  | 3.4 | 18.5 |  |
Foreign currency forward and cross currency swap contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional value of contracts |  | 107.6 | 88.2 |  |
Derivative adjustments, net of reclassification adjustments |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts |  | 26.3 | $ 34.0 | $ 1.0 |
Derivative adjustments, net of reclassification adjustments | Cash flow hedge, Pinnacle |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts |  | $ 42.0 |  |  |

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