Short-Term and Long-Term Investments

3 Months Ended

Jan. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Short-Term and Long-Term Investments

SHORT-TERM AND LONG-TERM INVESTMENTS

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

	January 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	239,404	$	—	(530		)	$	238,874
Included in long-term investments	59,313		—		(162		)	59,151
	$	298,717	$	—	$	(692	)	$	298,025
Commercial paper:
Included in short-term investments	$	39,868	1		—			$	39,869
	$	39,868	$	1	$	—		$	39,869

	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 final legal maturities of debt investments at January 31, 2018 (in thousands):

	Amortized Cost		Estimated Fair Value
Less than one year	$	279,272	$	278,743
Due in 1-2 years	59,313		59,151
	$	338,585	$	337,894