The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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+ Details

Non-Marketable Equity Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jul. 31, 2012	Jul. 31, 2012	Jul. 31, 2011
Fair Value [Line Items]
Write-down of long-term investments	$ (452)	$ (452)	$ (999)
Fair Value, Measurements, Nonrecurring \| Other Long-Term Assets
Fair Value [Line Items]
Non-marketable equity securities			92
Fair Value, Measurements, Nonrecurring \| Other Long-Term Assets \| Significant Unobservable Inputs (Level 3)
Fair Value [Line Items]
Non-marketable equity securities			$ 92