Marketable Securities

6 Months Ended

Apr. 30, 2013

Investments, Debt and Equity Securities [Abstract]

MARKETABLE SECURITIES

MARKETABLE SECURITIES

As of the dates indicated, short-term investments are comprised of the following (in thousands):

	April 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. government obligations	$	99,952	$	21	$	—	$	99,973
Included in short-term investments	$	99,952	$	21	$	—	$	99,973

	October 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. government obligations	$	49,987	$	70	$	—	$	50,057
Included in short-term investments	$	49,987	$	70	$	—	$	50,057

The following table summarizes final legal maturities of debt investments at April 30, 2013 (in thousands):

	Amortized Cost		Estimated Fair Value
Less than one year	$	99,952	$	99,973
Due in 1-2 years	—		—
	$	99,952	$	99,973