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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 24, 2019
Nov. 25, 2018
Nov. 24, 2019
Nov. 25, 2018
Aug. 25, 2019
May 26, 2019
Aug. 26, 2018
May 27, 2018
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 $ (1.1) $ 105.9 $ (2.7) $ 48.0        
Deferred gain in AOCI upon settlement of contracts 7,690.6 7,303.3 7,690.6 $ 7,303.3 $ 7,516.8 $ 7,463.7 $ 3,815.0 $ 3,756.6
Setoff amounts applied against total derivative assets 1.3   1.3     0.5    
Setoff amounts applied against total derivative liabilities 0.8   0.8     0.4    
Level 2                
Derivative Instruments, Gain (Loss) [Line Items]                
Maximum amount of loss due to credit risk of counterparties 0.5   0.5          
Prepaid expenses and other current assets                
Derivative Instruments, Gain (Loss) [Line Items]                
Amounts representing a right to reclaim cash collateral 2.1   2.1          
Amounts representing an obligation to return cash collateral           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 25.1   25.1     140.1    
Commodity contracts | Sales contracts                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional value of contracts 8.8   8.8     18.5    
Foreign exchange contracts                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional value of contracts 97.2   97.2     88.2    
Accumulated Gain (Loss), Net, Cash Flow Hedge                
Derivative Instruments, Gain (Loss) [Line Items]                
Deferred gain in AOCI upon settlement of contracts 30.8   30.8     $ 34.0    
Accumulated Gain (Loss), Net, Cash Flow Hedge | Cash flow hedge, Pinnacle                
Derivative Instruments, Gain (Loss) [Line Items]                
Deferred gain in AOCI upon settlement of contracts $ 43.8   $ 43.8