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Fair Value Disclosures (Level 4 marketable securities) (Details 2) (USD $) In Thousands, unless otherwise specified | Oct. 31, 2012 | Oct. 31, 2011
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Fair Value Disclosures (Textual) [Abstract] |  |
Marketable Securities, Maturity Date Range, Min | 1 month |
Marketable Securities, Maturity Date Range, Max | 26 months |
Summary of amortized cost gross unrealized holding gains and losses |  |
Amortized cost | $ 438,755 | $ 233,852
Gross unrealized holding gains | 451 | 28
Gross unrealized holding losses | (138) | (308)
Fair value | $ 439,068 | $ 233,572

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