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Fair Value Disclosures (Level 4 marketable securities) (Details 2) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Oct. 31, 2013
Fair Value Disclosures (Textual) [Abstract]    
Marketable Securities Maturities Term Minimum 5 days  
Marketable Securities Maturities Term Maximum 19 months  
Summary of amortized cost gross unrealized holding gains and losses    
Amortized cost $ 13,045 $ 52,502
Available For Sale Securities Gross Unrealized Gain Accumulated Investments 0 71
Available For Sale Securities Gross Unrealized Loss Accumulated Investments (45) (65)
Fair value $ 13,000 $ 52,508