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Investments (Tables)
 9 Months Ended
Oct. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Summary of Debt Securities
As of October 31, 2023, debt securities consisted of the following (in thousands):
Amortized CostUnrealized GainsUnrealized LossesAggregate Fair Value
U.S. treasury securities$2,307,535 $51 $(9,121)$2,298,465 
U.S. agency obligations787,767 254 (2,376)785,645 
Corporate bonds1,771,472 355 (21,031)1,750,796 
Commercial paper1,111,886 — (1)1,111,885 
Total debt securities$5,978,660 $660 $(32,529)$5,946,791 
Included in Cash and cash equivalents$659,919 $— $— $659,919 
Included in Marketable securities$5,318,741 $660 $(32,529)$5,286,872 
As of January 31, 2023, debt securities consisted of the following (in thousands):
Amortized CostUnrealized GainsUnrealized LossesAggregate Fair Value
U.S. treasury securities$2,455,739 $77 $(6,765)$2,449,051 
U.S. agency obligations325,664 — (3,874)321,790 
Corporate bonds966,801 1,617 (6,715)961,703 
Commercial paper1,016,641 — (5)1,016,636 
Total debt securities$4,764,845 $1,694 $(17,359)$4,749,180 
Included in Cash and cash equivalents$594,864 $— $(1)$594,863 
Included in Marketable securities$4,169,980 $1,694 $(17,357)$4,154,317 
Contractual Maturity of Debt Securities
The contractual maturities of debt securities were as follows (in thousands):
October 31, 2023
Due within 1 year$3,885,682 
Due in 1 year through 5 years2,061,109 
Total debt securities$5,946,791 
Equity Investments
Equity investments consisted of the following (in thousands):
Condensed Consolidated Balance Sheets LocationOctober 31, 2023January 31, 2023
Money market funds Cash and cash equivalents$675,910 $902,226 
Non-marketable equity investments measured using the measurement alternative Other assets250,311 261,922 
Marketable equity investments Marketable securities29,173 80,766 
Total equity investments$955,394 $1,244,914 
Realized and Unrealized Gains and Losses With Equity Investments
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,
2023202220232022
Net realized gains (losses) recognized on equity investments sold (1)
$(807)$4,514 $1,984 $(365)
Net unrealized gains (losses) recognized on equity investments held as of the end of the period(13,562)(155)(23,529)(19,121)
Total net gains (losses) recognized in Other income (expense), net$(14,369)$4,359 $(21,545)$(19,486)
(1)Reflects the difference between the sale proceeds and the carrying value of the equity investments at the beginning of the period.
Carrying Values Of Non-marketable Equity Investments The carrying values for our non-marketable equity investments are summarized below (in thousands):
October 31, 2023January 31, 2023
Total initial cost$207,485 $206,833 
Cumulative net unrealized gains (losses)42,826 55,089 
Carrying value$250,311 $261,922 
Carrying Values Of Marketable Equity Investments The carrying values for our marketable equity investments are summarized below (in thousands):
October 31, 2023January 31, 2023
Total initial cost$14,817 $38,449 
Cumulative net unrealized gains (losses)14,356 42,317 
Carrying value
$29,173 $80,766