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DERIVATIVE FINANCIAL INSTRUMENTS Pretax Impact of Cash Flow Hedges on the Consolidated Condensed Statements of Income (Details) (Cash Flow Hedging [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 30, 2011
Oct. 31, 2010
Oct. 30, 2011
Oct. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ 22.7 $ 115.0 $ 17.2 $ 118.7
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 30.7 (11.1) 71.2 (28.6)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net (1.0) 1.3 (1.2) 0.8
Grain Contracts [Member] | Cost of Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (2.7) 77.4 (16.6) 92.2
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 24.3 1.3 68.1 (2.7)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0.9 (0.1) 0.7
Lean Hog Contracts [Member] | Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 21.2 36.6 29.3 31.6
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 6.8 (9.2) 5.1 (19.7)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net (1.0) 0.4 (1.1) 0.1
Interest Rate Swap [Member] | Interest Expense [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 0 (0.7) 0 (1.2)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (0.6) (2.4) (2.4) (3.5)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 0 0
Foreign Exchange Contract [Member] | Operating Expense [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 4.2 1.7 4.5 (3.9)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.2 (0.8) 0.4 (2.7)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0 $ 0 $ 0 $ 0