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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Financial Assets:    
Marketable securities $ 2,004,410 $ 572,060
Commercial paper    
Financial Assets:    
Marketable securities 26,222 37,894
Agency bonds    
Financial Assets:    
Marketable securities 461,365 141,163
Corporate and other debt securities    
Financial Assets:    
Marketable securities 466,256 321,166
U.S. government agency securities    
Financial Assets:    
Marketable securities 834,665 71,837
Treasury bills    
Financial Assets:    
Marketable securities 215,902  
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 1,576,855 111,479
Marketable securities 2,004,410 572,060
Total financial assets 3,588,733 685,940
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 26,222 37,894
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 461,365 141,163
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 466,256 321,166
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 834,665 71,837
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 215,902  
Fair Value, Recurring Basis | Certificates of deposit    
Financial Assets:    
Prepaid expenses and other current assets 100 100
Other assets, noncurrent 2,238 2,301
Fair Value, Recurring Basis | Convertible note included in other assets, noncurrent    
Financial Assets:    
Other assets, noncurrent 5,130  
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 958,357 96,486
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 618,498  
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Cash equivalents   4,994
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Cash equivalents   9,999
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1    
Financial Assets:    
Cash equivalents 958,357 96,486
Marketable securities 0 0
Total financial assets 958,357 96,486
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  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Certificates of deposit    
Financial Assets:    
Prepaid expenses and other current assets 0 0
Other assets, noncurrent 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Convertible note included in other assets, noncurrent    
Financial Assets:    
Other assets, noncurrent 0  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Money market funds    
Financial Assets:    
Cash equivalents 958,357 96,486
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper    
Financial Assets:    
Cash equivalents   0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Agency bonds    
Financial Assets:    
Cash equivalents   0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2    
Financial Assets:    
Cash equivalents 618,498 14,993
Marketable securities 2,004,410 572,060
Total financial assets 2,625,246 589,454
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 26,222 37,894
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 461,365 141,163
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 466,256 321,166
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 834,665 71,837
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 215,902  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Certificates of deposit    
Financial Assets:    
Prepaid expenses and other current assets 100 100
Other assets, noncurrent 2,238 2,301
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Convertible note included in other assets, noncurrent    
Financial Assets:    
Other assets, noncurrent 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 618,498  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper    
Financial Assets:    
Cash equivalents   4,994
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds    
Financial Assets:    
Cash equivalents   9,999
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3    
Financial Assets:    
Cash equivalents 0 0
Marketable securities 0 0
Total financial assets 5,130 0
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  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Certificates of deposit    
Financial Assets:    
Prepaid expenses and other current assets 0 0
Other assets, noncurrent 0 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Convertible note included in other assets, noncurrent    
Financial Assets:    
Other assets, noncurrent 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  
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper    
Financial Assets:    
Cash equivalents   0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Agency bonds    
Financial Assets:    
Cash equivalents   $ 0