Investments (Tables)

12 Months Ended

Jan. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of Marketable Securities

As of January 31, 2022 and 2021, our marketable securities consisted of the following: 

	As of January 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Commercial paper	$	28,723	$	—	$	—	$	28,723
Agency bonds	632,935		2		(3,328)		629,609
Corporate and other debt securities	282,124		5		(1,202)		280,927
U.S. government agency securities	3,046,742		28		(19,261)		3,027,509
Treasury bills	389,826		—		(148)		389,678
Marketable securities	$	4,380,350	$	35	$	(23,939)	$	4,356,446

	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 January 31, 2022 and 2021:

	As of January 31,
	2022		2021
	(in thousands)
Less than one year	$	2,387,139	$	1,017,048
Due in one to five years	1,969,307		987,362
Total	$	4,356,446	$	2,004,410

Investment Holdings, Schedule of Investments

Strategic investments by form and measurement category as of January 31, 2022 were as follows:

	Measurement Category
	Fair Value		Measurement Alternative		Equity Method		Total
	(in thousands)
Equity securities	$	168,784	$	91,399	$	93,400	$	353,583
Debt securities	14,231		—		—		14,231
Strategic investments	$	183,015	$	91,399	$	93,400	$	367,814

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