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Fair Value Measurements (Tables)
 9 Months Ended
Oct. 31, 2021
Fair Value Disclosures [Abstract]  
Information about Assets that are 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, 2021 (in thousands):
Level 1Level 2Level 3Total
U.S. treasury securities$1,246,537 $— $— $1,246,537 
U.S. agency obligations— 231,828 — 231,828 
Corporate bonds— 425,665 — 425,665 
Commercial paper— 934,715 — 934,715 
Money market funds280,481 — — 280,481 
Marketable equity investments134,462 — — 134,462 
Foreign currency derivative assets— 24,166 — 24,166 
Total assets$1,661,480 $1,616,374 $— $3,277,854 
Foreign currency derivative liabilities$— $24,197 $— $24,197 
Total liabilities$— $24,197 $— $24,197 
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, 2021 (in thousands):
Level 1Level 2Level 3Total
U.S. treasury securities$1,054,341 $— $— $1,054,341 
U.S. agency obligations— 504,445 — 504,445 
Corporate bonds— 347,802 — 347,802 
Commercial paper— 664,262 — 664,262 
Money market funds659,964 — — 659,964 
Marketable equity investments21,300 — — 21,300 
Foreign currency derivative assets— 3,221 — 3,221 
Total assets$1,735,605 $1,519,730 $— $3,255,335 
Foreign currency derivative liabilities$— $49,456 $— $49,456 
Total liabilities$— $49,456 $— $49,456