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Fair Value Measurements (Details Textual) (4.0% Convertible Senior Notes due March 15, 2015 [Member])
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Oct. 31, 2012
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Aug. 13, 2012
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Oct. 31, 2011
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Oct. 31, 2010
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4.0% Convertible Senior Notes due March 15, 2015 [Member]
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| Debt Instrument [Line Items] | ||||
| Interest rate on convertible notes | 4.00% | 4.00% | 4.00% | 4.00% |