Short-Term and Long-Term Investments (Tables)

12 Months Ended

Oct. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Short-term and Long-term investments

As of October 31, 2012, short-term investments were comprised of the following (in thousands):

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

As of October 31, 2013, short-term and long-term investments are comprised of the following (in thousands):

	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

Investments Classified by Contractual Maturity Date

The following table summarizes the legal maturities of debt investments at October 31, 2013:

	October 31, 2013
	Amortized Cost		Estimated Fair Value
Less than one year	$	124,968	$	124,979
Due in 1-2 years	14,996		15,031
	$	139,964	$	140,010