Investments (Tables)

9 Months Ended

Oct. 31, 2018

As of October 31, 2018, debt securities consisted of the following (in thousands):



	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
U.S. agency obligations	$	188,241	$	1	$	(375	)	$	187,867
U.S. treasury securities	376,887		—		(437		)	376,450
Corporate bonds	402,034		6		(1,027		)	401,013
Commercial paper	283,260		—		—			283,260
	$	1,250,422	$	7	$	(1,839	)	$	1,248,590
Included in cash and cash equivalents	$	239,214	$	—	$	—		$	239,214
Included in marketable securities	$	1,011,208	$	7	$	(1,839	)	$	1,009,376

As of January 31, 2018, debt securities consisted of the following (in thousands):



	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
U.S. agency obligations	$	683,551	$	—	$	(1,127	)	$	682,424
U.S. treasury securities	797,977		—		(1,142		)	796,835
Corporate bonds	470,259		16		(1,154		)	469,121
Commercial paper	602,727		—		—			602,727
	$	2,554,514	$	16	$	(3,423	)	$	2,551,107
Included in cash and cash equivalents	$	417,613	$	—	$	(1	)	$	417,612
Included in marketable securities	$	2,136,901	$	16	$	(3,422	)	$	2,133,495

Equity investments consisted of the following (in thousands):



	Condensed Consolidated Balance Sheets Location	October 31, 2018		January 31, 2018
Money market funds	Cash and cash equivalents	$	194,272	$	551,804
Marketable equity investments	Marketable securities	32,333		—
Non-marketable equity investments	Other assets	27,661		28,005
		$	254,266	$	579,809

Realized and unrealized gains and losses associated with our equity investments consisted of the following (in thousands):



	Three Months Ended October 31,					Nine Months Ended October 31,
	2018		2017			2018		2017
Net realized gains (losses) recognized on equity investments sold	$	8,193	$	194		$	8,193	$	720
Net unrealized gains (losses) recognized on equity investments held	20,333		(100		)	20,333		(100		)
Total net gains (losses) recognized in other income (expense), net	$	28,526	$	94		$	28,526	$	620