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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 30, 2015
Aug. 24, 2014
Feb. 24, 2013
May. 31, 2015
Derivative Financial Instruments [Line Items]        
Hedge for anticipated consumption of commodity inputs, period 36 months      
Unamortized amounts of deferred gain (loss) $ (359.8)     $ (329.5)
Gain on change of fair value of senior long-term debt   $ 2.5    
Amounts representing a right to reclaim cash collateral included in prepaid expenses and other current assets 12.9     5.9
Derivative asset prior to offsetting to total derivative 14.0     7.3
Derivative liability prior to offsetting to total derivative 26.9     13.2
Maximum amount of loss due to the credit risk of the counterparties 22.6      
Open commodity purchase contracts        
Derivative Financial Instruments [Line Items]        
Notional value of open commodity contracts 446.9     554.9
Open commodity sales contracts        
Derivative Financial Instruments [Line Items]        
Notional value of open commodity contracts 298.0     393.1
Selling, general and administrative expense        
Derivative Financial Instruments [Line Items]        
Reduction of net interest expense due to impact of interest rate swap contracts   0.3    
Interest rate contracts        
Derivative Financial Instruments [Line Items]        
Loss on change in fair value of interest rate swap contracts   $ 2.2    
Reduction of net interest expense due to impact of interest rate swap contracts 0.6      
Foreign exchange contracts        
Derivative Financial Instruments [Line Items]        
Notional value of open commodity contracts 106.7     $ 108.6
Cash flow hedging | 2043 Maturity        
Derivative Financial Instruments [Line Items]        
Unrealized gain (loss) on derivative adjustments     $ 4.2  
Cash flow hedging | 2043 Maturity | Cash flow hedges        
Derivative Financial Instruments [Line Items]        
Unamortized amounts of deferred gain (loss) 3.0      
Cash flow hedging | 2023 Maturity        
Derivative Financial Instruments [Line Items]        
Unrealized gain (loss) on derivative adjustments     $ (2.0)  
Cash flow hedging | 2023 Maturity | Cash flow hedges        
Derivative Financial Instruments [Line Items]        
Unamortized amounts of deferred gain (loss) (1.3)      
Fair value hedging | Interest rate contracts        
Derivative Financial Instruments [Line Items]        
Cumulative adjustment to fair value of hedged debt instruments 12.6      
Unamortized amount of deferred gain on debt instruments hedged $ 11.2