Investments (Tables)

9 Months Ended

Oct. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of Marketable Securities

As of October 31, 2021 and January 31, 2021, our marketable securities consisted of the following: 

	As of October 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Commercial paper	$	23,482	$	—	$	—	$	23,482
Agency bonds	437,782		13		(342)		437,453
Corporate and other debt securities	314,888		56		(423)		314,521
U.S. government agency securities	3,000,441		17		(4,413)		2,996,045
Treasury bills	324,046		—		(27)		324,019
Marketable securities	$	4,100,639	$	86	$	(5,205)	$	4,095,520

	As of January 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Commercial paper	$	26,222	$	—	$	—	$	26,222
Agency bonds	461,335		79		(49)		461,365
Corporate and other debt securities	465,207		1,113		(64)		466,256
U.S. government agency securities	834,894		28		(257)		834,665
Treasury bills	215,902		6		(6)		215,902
Marketable securities	$	2,003,560	$	1,226	$	(376)	$	2,004,410

Summary of Contractual Maturities of Marketable Securities

The following table presents the contractual maturities of our marketable securities as of October 31, 2021 and January 31, 2021:

	As of
	October 31, 2021		January 31, 2021
	(in thousands)
Less than one year	$	2,143,667	$	1,017,048
Due in one to five years	1,951,853		987,362
Total	$	4,095,520	$	2,004,410

Summary of Strategic Investments

Strategic investments by form and measurement category as of October 31, 2021 were as follows:

	Measurement Category
	Fair Value		Measurement Alternative		Equity Method		Total
	(in thousands)
Equity securities	$	179,918	$	13,349	$	93,117	$	286,384
Debt securities	13,366		—		—		13,366
Strategic investments	$	193,284	$	13,349	$	93,117	$	299,750

Strategic investments by form and measurement category as of January 31, 2021 were as follows:

	Measurement Category
	Fair Value		Measurement Alternative		Equity Method		Total
	(in thousands)
Equity securities	$	—	$	13,538	$	—	$	13,538
Debt securities	5,130		—		—		5,130
Strategic investments	$	5,130	$	13,538	$	—	$	18,668