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Derivative Instruments and Fair Value Measurement of Assets and Liabilities Derivative Instruments in Statement of Financial Position, Fair Value (Details) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2013
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Oct. 31, 2012
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|---|---|---|
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Prepaid And Other Current Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Aluminum derivatives | $ 0 | $ 10 |
| Foreign currency derivatives | 29 | 6 |
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Accrued Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Aluminum derivatives | 338 | 170 |
| Foreign currency derivatives | 124 | 23 |
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Other Non-Current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Aluminum derivatives | $ 0 | $ 4 |