Derivative Instruments and Fair Value Measurement of Assets and Liabilities Fair Value of Derivative Instruments Outstanding (Details) In Thousands, unless otherwise specified	Jan. 31, 2013 Sell EUR, buy GBP [Member] USD ($)	Jan. 31, 2013 Sell EUR, buy GBP [Member] EUR (€)	Oct. 31, 2012 Sell EUR, buy GBP [Member] USD ($)	Oct. 31, 2012 Sell EUR, buy GBP [Member] EUR (€)	Jan. 31, 2013 Sell EUR, buy USD [Member] USD ($)	Oct. 31, 2012 Sell EUR, buy USD [Member] USD ($)	Jan. 31, 2013 Sell CAD, buy USD [Member] USD ($)	Oct. 31, 2012 Sell CAD, buy USD [Member] USD ($)	Jan. 31, 2013 Buy GBP, sell USD [Member] USD ($)	Oct. 31, 2012 Buy GBP, sell USD [Member] USD ($)	Jan. 31, 2013 Forward Purchase Aluminum Contracts [Member] Commodity Contract [Member] USD ($)	Oct. 31, 2012 Forward Purchase Aluminum Contracts [Member] Commodity Contract [Member] USD ($)	Jan. 31, 2013 Forward Sales Aluminum Contracts [Member] Commodity Contract [Member] USD ($)	Oct. 31, 2012 Forward Sales Aluminum Contracts [Member] Commodity Contract [Member] USD ($)	Jan. 31, 2013 Aluminum Swap Contracts [Member] Commodity Contract [Member] USD ($)	Oct. 31, 2012 Aluminum Swap Contracts [Member] Commodity Contract [Member] USD ($)	Jan. 31, 2013 Not Designated as Hedging Instrument [Member] Forward Purchase Aluminum Contracts [Member] Commodity Contract [Member] lb	Oct. 31, 2012 Not Designated as Hedging Instrument [Member] Forward Purchase Aluminum Contracts [Member] Commodity Contract [Member] lb	Jan. 31, 2013 Not Designated as Hedging Instrument [Member] Forward Sales Aluminum Contracts [Member] Commodity Contract [Member] lb	Oct. 31, 2012 Not Designated as Hedging Instrument [Member] Forward Sales Aluminum Contracts [Member] Commodity Contract [Member] lb	Jan. 31, 2013 Not Designated as Hedging Instrument [Member] Aluminum Swap Contracts [Member] Commodity Contract [Member] lb	Oct. 31, 2012 Not Designated as Hedging Instrument [Member] Aluminum Swap Contracts [Member] Commodity Contract [Member] lb
Derivatives, Fair Value [Line Items]
Aluminum forward purchase and swap contracts																	1,213,000	2,370,000			163,000	0
Aluminum swap contracts																			(1,488,000)	0
Price Risk Derivative Insruments Not Designated as Hedging Instruments, at Fair Value, Net											$ 46	$ (164)
Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value													(78)	0	(8)	0
Foreign currency exchange derivatives, notional amount (stated in foreign currency)		940		545	8,873	7,663	443	608	1,756	1,934
Foreign currency exchange derivatives, fair value (stated in USD)	$ (7)		$ 0		$ (111)	$ (23)	$ (5)	$ 1	$ 11	$ 5