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Derivatives and Hedging - Outstanding Contracts (Details)
item in Millions, bu in Millions, $ in Millions
6 Months Ended 12 Months Ended
Apr. 24, 2016
USD ($)
item
T
bu
Oct. 25, 2015
USD ($)
item
T
bu
Derivatives and hedging    
Maximum number of upcoming fiscal years to hedge grain or natural gas exposure 2 years  
Accumulated change, pretax, in accumulated gains and (losses) from derivative instruments designated and qualifying as the effective portion of cash flow hedges | $ $ (2.1) $ 1.0
The Company expects to recognize the majority of hedging losses over this period 12 months  
Corn | Derivatives not designated as hedges    
Derivatives and hedging    
Futures contracts, volume (in million bushels) 3.9 2.6
Corn | Cash Flow Hedges    
Derivatives and hedging    
Futures contracts, volume (in million bushels) 26.4 20.1
Corn | Fair Value Hedges    
Derivatives and hedging    
Futures contracts, volume (in million bushels) 1.0 5.3
Lean hogs | Fair Value Hedges    
Derivatives and hedging    
Futures contracts, volume ( in centum weight) | item 0.2 0.4
Soybean meal | Derivatives not designated as hedges    
Derivatives and hedging    
Futures contracts, volume (in tons) | T 17,900 11,500