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Fair Value Disclosures (Level 4 marketable securities) (Details 2) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Oct. 31, 2012
Fair Value Disclosures (Textual) [Abstract]    
Marketable Securities Maturities Term Minimum 19 days  
Marketable Securities Maturities Term Maximum 28 months  
Summary of amortized cost gross unrealized holding gains and losses    
Amortized cost $ 122,423 $ 438,755
Available For Sale Securities Gross Unrealized Gain Accumulated Investments 171 451
Available For Sale Securities Gross Unrealized Loss Accumulated Investments (67) (138)
Fair value $ 122,527 $ 439,068