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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Oct. 31, 2021
Jan. 31, 2021
Financial Assets:    
Marketable securities $ 4,095,520 $ 2,004,410
Commercial paper    
Financial Assets:    
Marketable securities 23,482 26,222
Agency bonds    
Financial Assets:    
Marketable securities 437,453 461,365
Corporate and other debt securities    
Financial Assets:    
Marketable securities 314,521 466,256
U.S. government agency securities    
Financial Assets:    
Marketable securities 2,996,045 834,665
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 872,611 1,576,855
Marketable securities 4,095,520 2,004,410
Publicly held equity securities included in strategic investments 179,918  
Total financial assets 5,161,712 3,588,733
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 23,482 26,222
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 437,453 461,365
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 314,521 466,256
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 2,996,045 834,665
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 324,019 215,902
Fair Value, Recurring Basis | Certificates of deposit    
Financial Assets:    
Certificate of deposit included in prepaid expenses and other current assets   100
Certificates of deposit included in other assets, noncurrent 297 2,238
Fair Value, Recurring Basis | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 13,366 5,130
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 295,943 958,357
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 576,668 618,498
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1    
Financial Assets:    
Cash equivalents 295,943 958,357
Marketable securities 0 0
Publicly held equity securities included in strategic investments 179,918  
Total financial assets 475,861 958,357
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Agency bonds    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | U.S. government agency securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Certificates of deposit    
Financial Assets:    
Certificate of deposit included in prepaid expenses and other current assets   0
Certificates of deposit included in other assets, noncurrent 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Money market funds    
Financial Assets:    
Cash equivalents 295,943 958,357
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2    
Financial Assets:    
Cash equivalents 576,668 618,498
Marketable securities 4,095,520 2,004,410
Total financial assets 4,672,485 2,625,246
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 23,482 26,222
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 437,453 461,365
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 314,521 466,256
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 2,996,045 834,665
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 324,019 215,902
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Certificates of deposit    
Financial Assets:    
Certificate of deposit included in prepaid expenses and other current assets   100
Certificates of deposit included in other assets, noncurrent 297 2,238
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Money market funds    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills    
Financial Assets:    
Cash equivalents 576,668 618,498
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3    
Financial Assets:    
Cash equivalents 0 0
Marketable securities 0 0
Total financial assets 13,366 5,130
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Agency bonds    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | U.S. government agency securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Certificates of deposit    
Financial Assets:    
Certificate of deposit included in prepaid expenses and other current assets   0
Certificates of deposit included in other assets, noncurrent 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 13,366 5,130
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Money market funds    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills    
Financial Assets:    
Cash equivalents $ 0 $ 0