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Derivative Financial Instruments - Outstanding Derivative Contracts Entered into Hedge Forecasted Purchases (Detail) (Inventory Commodity, United States Dollars, USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Inventory Commodity | United States Dollars
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notional Amount $ 238,686invest_DerivativeNotionalAmount
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Fair Value $ 19,427us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
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