Derivative Financial Instruments - Outstanding Derivative Contracts that were Entered into Hedge Forecasted Purchases and Future Cash Receipts (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	$ 279,655
Fair Value	7,496
Inventory Commodity [Member] | United States Dollar [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	262,798
Fair Value	7,906
Inventory Commodity [Member] | Minimum [Member] | United States Dollar [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity	2012-11
Inventory Commodity [Member] | Maximum [Member] | United States Dollar [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity	2013-10
Accounts Receivable Commodity [Member] | British pounds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	16,857
Fair Value	$ (410)
Accounts Receivable Commodity [Member] | Minimum [Member] | British pounds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity	2012-11
Accounts Receivable Commodity [Member] | Maximum [Member] | British pounds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity	2013-10