Short-term and Long-term Investments (Tables)

6 Months Ended

Apr. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Short-term and long-term investments

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

	April 30, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	60,042	$	16	—		$	60,058
Included in long-term investments	14,997		45		—		15,042
	$	75,039	$	61	$	—	$	75,100
Commercial paper:
Included in short-term investments	29,991		—		—		29,991
	$	29,991	$	—	$	—	$	29,991

	October 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	99,974	$	11	$	—	$	99,985
Included in long-term investments	14,996		35		—		15,031
	$	114,970	$	46	$	—	$	115,016
Commercial paper:
Included in short-term investments	24,994		—		—		24,994
	$	24,994	$	—	$	—	$	24,994

Legal maturities of debt investments

The following table summarizes final legal maturities of debt investments at April 30, 2014 (in thousands):

	Amortized Cost		Estimated Fair Value
Less than one year	$	90,033	$	90,049
Due in 1-2 years	14,997		15,042
	$	105,030	$	105,091