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Fair Value Measurements
9 Months Ended
Oct. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present information about our financial instruments that are measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value:
As of October 31, 2021
Fair ValueLevel 1Level 2Level 3
(in thousands)
Financial Assets:
Money market funds$295,943 $295,943 $— $— 
Treasury bills576,668 — 576,668 — 
Cash equivalents872,611 295,943 576,668 — 
Commercial paper23,482 — 23,482 — 
Agency bonds437,453 — 437,453 — 
Corporate and other debt securities314,521 — 314,521 — 
U.S. government agency securities2,996,045 — 2,996,045 — 
Treasury bills324,019 — 324,019 — 
Marketable securities4,095,520 — 4,095,520 — 
Publicly held equity securities included in strategic investments179,918 179,918 — — 
Privately held debt securities included in strategic investments13,366 — — 13,366 
Certificates of deposit included in other assets, noncurrent297 — 297 — 
Total financial assets$5,161,712 $475,861 $4,672,485 $13,366 
As of January 31, 2021
Fair ValueLevel 1Level 2Level 3
(in thousands)
Financial Assets:
Money market funds$958,357 $958,357 $— $— 
Treasury bills618,498 — 618,498 — 
Cash equivalents1,576,855 958,357 618,498 — 
Commercial paper26,222 — 26,222 — 
Agency bonds461,365 — 461,365 — 
Corporate and other debt securities466,256 — 466,256 — 
U.S. government agency securities834,665 — 834,665 — 
Treasury bills215,902 — 215,902 — 
Marketable securities2,004,410 — 2,004,410 — 
Certificate of deposit included in prepaid expenses and other current assets100 — 100 — 
Certificates of deposit included in other assets, noncurrent2,238 — 2,238 — 
Privately held debt securities included in strategic investments5,130 — — 5,130 
Total financial assets$3,588,733 $958,357 $2,625,246 $5,130 
We classify our highly liquid money market funds and publicly held equity securities within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. We classify our commercial paper, agency bonds, corporate and other debt securities, U.S. government agency securities, treasury bills, and certificates of deposit within Level 2 because they are valued using inputs other than quoted prices that are directly or indirectly observable in the market, including readily available pricing sources for the identical underlying security, which may not be actively traded. We classify our privately held debt securities as Level 3 due to the lack of relevant observable market data over fair value inputs, such as the probability weighting of the various scenarios that can impact settlement of the arrangement.