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Fair Value Measurements (Tables)
 9 Months Ended
Oct. 31, 2023
Fair Value Disclosures [Abstract]  
Information about Assets Measured at Fair Value on a Recurring Basis
The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of October 31, 2023 (in thousands):
Level 1Level 2Level 3Total
U.S. treasury securities$2,298,465 $— $— $2,298,465 
U.S. agency obligations— 785,645 — 785,645 
Corporate bonds— 1,750,796 — 1,750,796 
Commercial paper— 1,111,885 — 1,111,885 
Money market funds675,910 — — 675,910 
Marketable equity investments29,173 — — 29,173 
Foreign currency derivative assets— 90,536 — 90,536 
Total assets$3,003,548 $3,738,862 $— $6,742,410 
Foreign currency derivative liabilities$— $20,268 $— $20,268 
Total liabilities$— $20,268 $— $20,268 
The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of January 31, 2023 (in thousands):
Level 1Level 2Level 3Total
U.S. treasury securities$2,449,051 $— $— $2,449,051 
U.S. agency obligations— 321,790 — 321,790 
Corporate bonds— 961,703 — 961,703 
Commercial paper— 1,016,636 — 1,016,636 
Money market funds902,226 — — 902,226 
Marketable equity investments80,766 — — 80,766 
Foreign currency derivative assets— 64,824 — 64,824 
Total assets$3,432,043 $2,364,953 $— $5,796,996 
Foreign currency derivative liabilities$— $33,972 $— $33,972 
Total liabilities$— $33,972 $— $33,972