Marketable Debt Securities (Tables)

12 Months Ended

Oct. 31, 2011

Investments, Debt and Equity Securities [Abstract]

Long Term Investments

As of October 31, 2011, long-term investments in marketable debt securities are comprised of the following (in thousands):

	October 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
US government obligations	$	49,933	$	331	$	—	$	50,264
	$	49,933	$	331	$	—	$	50,264

Legal maturities of debt investments

The following table summarizes final legal maturities of debt investments at October 31, 2011 (in thousands):

	Amortized Cost		Estimated Fair Value
Less than one year	$	—	$	—
Due in 1-2 years	49,933		50,264
	$	49,933	$	50,264