Fair Value Disclosures (Details 2) (USD $) In Thousands	Jul. 31, 2011	Oct. 31, 2010
Summary of amortized cost gross unrealized holding gains and losses
Amortized cost	$ 294,373	$ 197,699
Gross unrealized holding gains	71	180
Gross unrealized holding losses	(158)	(12)
Fair value of marketable securities	$ 294,286	$ 197,867

- Definition

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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