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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 25, 2018 | Feb. 27, 2022 | Feb. 28, 2021 | Feb. 27, 2022 | Feb. 28, 2021 | Nov. 28, 2021 | Aug. 29, 2021 | May 30, 2021 | Nov. 29, 2020 | Aug. 30, 2020 | May 31, 2020
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 |  | $ 2.1 | $ 0.6 | $ 1.8 | $ 1.1 |  |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts |  | 8,853.3 | $ 8,329.8 | 8,853.3 | $ 8,329.8 | $ 8,756.9 | $ 8,635.9 | $ 8,631.4 | $ 8,469.5 | $ 8,199.0 | $ 7,950.7
Setoff amounts applied against total derivative assets |  | 11.7 |  | 11.7 |  |  |  | 7.4 |  |  |
Setoff amounts applied against total derivative liabilities |  | 10.0 |  | 10.0 |  |  |  | 5.4 |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum amount of loss due to credit risk of counterparties |  | 0.7 |  | 0.7 |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount representing obligation to return cash |  | 1.7 |  | 1.7 |  |  |  | 2.0 |  |  |
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 |  | 123.3 |  | 123.3 |  |  |  | 148.8 |  |  |
Commodity contracts | Sales contracts |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of contracts |  | 154.5 |  | 154.5 |  |  |  | 159.4 |  |  |
Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of contracts |  | 88.2 |  | 88.2 |  |  |  | 111.4 |  |  |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts |  | 24.9 |  | 24.9 |  |  |  | $ 24.3 |  |  |
Cash flow hedges | Cash flow hedge, Pinnacle |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts |  | $ 35.8 |  | $ 35.8 |  |  |  |  |  |  |

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