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Investments (Tables)
 6 Months Ended
Jul. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Debt Securities
As of July 31, 2021, debt securities consisted of the following (in thousands):
Amortized CostUnrealized GainsUnrealized LossesAggregate Fair Value
U.S. treasury securities$1,096,642 $207 $(37)$1,096,812 
U.S. agency obligations189,188 66 — 189,254 
Corporate bonds372,240 275 (36)372,479 
Commercial paper780,888 — — 780,888 
$2,438,958 $548 $(73)$2,439,433 
Included in Cash and cash equivalents$359,551 $— $— $359,551 
Included in Marketable securities$2,079,407 $548 $(73)$2,079,882 
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 
$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 LocationJuly 31, 2021January 31, 2021
Money market funds Cash and cash equivalents$414,663 $659,964 
Equity investments accounted for under the equity method Other assets— 48,222 
Non-marketable equity investments measured using the measurement alternative Other assets125,075 73,142 
Marketable equity investments Marketable securities141,006 21,300 
$680,744 $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 July 31, Six Months Ended July 31,
2021202020212020
Net realized gains (losses) recognized on equity investments sold (1)
$2,767 $— $(6,379)$1,591 
Net unrealized gains (losses) recognized on equity investments held as of the end of the period103,478 1,909 106,575 (2,187)
Total net gains (losses) recognized in Other income (expense), net$106,245 $1,909 $100,196 $(596)
(1)Reflects the difference between the sale proceeds and the carrying value of the equity securities 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):
July 31, 2021January 31, 2021
Total initial cost$105,819 $65,377 
Cumulative net unrealized gains (losses)19,256 7,765 
Carrying value$125,075 $73,142 
Schedule of Marketable Equity Method Investments The carrying values for our marketable equity investments are summarized below (in thousands):
July 31, 2021January 31, 2021
Total initial cost$47,513 $5,000 
Cumulative net unrealized gains (losses)93,493 16,300 
Carrying value (1)
$141,006 $21,300 
(1)As of July 31, 2021, investments with a carrying value of $141 million are subject to a lock-up agreement through December 2021.