Short-Term and Long-Term Investments

12 Months Ended

Oct. 31, 2018

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM AND LONG-TERM INVESTMENTS

SHORT-TERM AND LONG-TERM INVESTMENTS

As of October 31, 2018, investments are comprised of the following (in thousands):

	October 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	139,365	$	—	$	(347	)	$	139,018
Included in long-term investments	59,029		—		(59		)	58,970
	$	198,394	$	—	$	(406	)	$	197,988
Commercial paper:
Included in short-term investments	$	9,963	$	—	$	—		$	9,963
	$	9,963	$	—	$	—		$	9,963

As of October 31, 2017, investments are comprised of the following (in thousands):

	October 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	249,498	$	—	$	(305	)	$	249,193
Included in long-term investments	49,910		—		(127		)	49,783
	$	299,408	$	—	$	(432	)	$	298,976
Commercial paper:
Included in short-term investments	$	29,939	$	1	$	—		$	29,940
	$	29,939	$	1	$	—		$	29,940

The following table summarizes the legal maturities of debt investments at October 31, 2018:

	October 31, 2018
	Amortized Cost		Estimated Fair Value
Less than one year	$	149,328	$	148,981
Due in 1-2 years	59,029		58,970
	$	208,357	$	207,951