Fair Value Disclosures (Level 4 marketable securities) (Details 2) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Oct. 31, 2011
Fair Value Disclosures (Textual) [Abstract]
Marketable Securities Maturities Term Minimum	1 month
Marketable Securities Maturities Term Maximum	12 months
Summary of amortized cost gross unrealized holding gains and losses
Amortized cost	$ 275,738	$ 233,852
Gross unrealized holding gains	229	28
Gross unrealized holding losses	(39)	(308)
Fair value	$ 275,928	$ 233,572

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details