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Investments (Tables)
 9 Months Ended
Oct. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Debt Securities
As of October 31, 2021, debt securities consisted of the following (in thousands):
Amortized CostUnrealized GainsUnrealized LossesAggregate Fair Value
U.S. treasury securities$1,246,777 $54 $(294)$1,246,537 
U.S. agency obligations232,209 2 (383)231,828 
Corporate bonds426,074 35 (444)425,665 
Commercial paper934,715 — — 934,715 
Total debt securities$2,839,775 $91 $(1,121)$2,838,745 
Included in Cash and cash equivalents$715,486 $1 $(2)$715,485 
Included in Marketable securities$2,124,289 $90 $(1,119)$2,123,260 
As of January 31, 2021, debt securities consisted of the following (in thousands):
Amortized CostUnrealized GainsUnrealized LossesAggregate Fair Value
U.S. treasury securities$1,054,146 $205 $(10)$1,054,341 
U.S. agency obligations504,298 196 (49)504,445 
Corporate bonds346,563 1,253 (14)347,802 
Commercial paper664,262 — — 664,262 
Total debt securities$2,569,269 $1,654 $(73)$2,570,850 
Included in Cash and cash equivalents$440,678 $— $— $440,678 
Included in Marketable securities$2,128,591 $1,654 $(73)$2,130,172 
Equity Investments
Equity investments consisted of the following (in thousands):
Condensed Consolidated Balance Sheets LocationOctober 31, 2021January 31, 2021
Money market funds Cash and cash equivalents$280,481 $659,964 
Equity investments accounted for under the equity method Other assets— 48,222 
Non-marketable equity investments measured using the measurement alternative Other assets169,929 73,142 
Marketable equity investments Marketable securities134,462 21,300 
Total equity investments$584,872 $802,628 
Gain (Loss) on Securities
Total 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,
2021202020212020
Net realized gains (losses) recognized on equity investments sold (1)
$11,759 $— $4,236 $1,591 
Net unrealized gains (losses) recognized on equity investments held as of the end of the period13,448 3,830 121,167 1,643 
Total net gains (losses) recognized in Other income (expense), net$25,207 $3,830 $125,403 $3,234 
(1)Reflects the difference between the sale proceeds and the carrying value of the equity investments at the beginning of the period.
Equity Securities without Readily Determinable Fair Value The carrying values for our non-marketable equity investments are summarized below (in thousands):
October 31, 2021January 31, 2021
Total initial cost$130,131 $65,377 
Cumulative net unrealized gains (losses)39,798 7,765 
Carrying value$169,929 $73,142 
Schedule of Marketable Equity Method Investments The carrying values for our marketable equity investments are summarized below (in thousands):
October 31, 2021January 31, 2021
Total initial cost$47,513 $5,000 
Cumulative net unrealized gains (losses)86,949 16,300 
Carrying value (1)
$134,462 $21,300 
(1)As of October 31, 2021, investments with a carrying value of $134 million are subject to a lock-up agreement through December 2021.