Short-Term and Long-Term Investments (Tables)

12 Months Ended

Oct. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Short-term and Long-term investments

As of October 31, 2013, 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

As of October 31, 2014, investments are comprised of the following (in thousands):

	October 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	110,182	$	29	$	—	$	110,211
Included in long-term investments	50,016		41		—		50,057
	$	160,198	$	70	$	—	$	160,268
Commercial paper:
Included in short-term investments	$	29,994	$	—	$	—	$	29,994
	$	29,994	$	—	$	—	$	29,994

Investments Classified by Contractual Maturity Date

The following table summarizes the legal maturities of debt investments at October 31, 2014:

	October 31, 2014
	Amortized Cost		Estimated Fair Value
Less than one year	$	140,176	$	140,205
Due in 1-2 years	50,016		50,057
	$	190,192	$	190,262