SHORT-TERM AND LONG-TERM INVESTMENTS

6 Months Ended

Apr. 30, 2017

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):

	April 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	255,042	$	—	(233		)	$	254,809
Included in long-term investments	89,987		—		(135		)	89,852
	$	345,029	$	—	$	(368	)	$	344,661
Commercial paper:
Included in short-term investments	$	19,970	—		—			$	19,970
	$	19,970	$	—	$	—		$	19,970

	October 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	260,125	$	140	$	(6	)	$	260,259
Included in long-term investments	90,145		57		(30		)	90,172
	$	350,270	$	197	$	(36	)	$	350,431
Commercial paper:
Included in short-term investments	$	14,989	—		—			$	14,989
	$	14,989	$	—	$	—		$	14,989

The following table summarizes the final legal maturities of debt investments at April 30, 2017 (in thousands):

	Amortized Cost		Estimated Fair Value
Less than one year	$	275,012	$	274,779
Due in 1-2 years	89,987		89,852
	$	364,999	$	364,631