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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jan. 31, 2022
Jan. 31, 2021
Financial Assets:    
Marketable securities $ 4,356,446 $ 2,004,410
Commercial paper    
Financial Assets:    
Marketable securities 28,723 26,222
Agency bonds    
Financial Assets:    
Marketable securities 629,609 461,365
Corporate and other debt securities    
Financial Assets:    
Marketable securities 280,927 466,256
U.S. government agency securities    
Financial Assets:    
Marketable securities 3,027,509 834,665
Treasury bills    
Financial Assets:    
Marketable securities 389,678 215,902
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 796,967 1,576,855
Marketable securities 4,356,446 2,004,410
Publicly held equity securities included in strategic investments 168,784  
Total financial assets 5,336,725 3,588,733
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 28,723 26,222
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 629,609 461,365
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 280,927 466,256
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,027,509 834,665
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 389,678 215,902
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 14,231 5,130
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 688,722 958,357
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 107,496 618,498
Fair Value, Recurring Basis | Corporate debt securities    
Financial Assets:    
Cash equivalents 749  
Fair Value, Recurring Basis | Level 1    
Financial Assets:    
Cash equivalents 688,722 958,357
Marketable securities 0 0
Publicly held equity securities included in strategic investments 168,784  
Total financial assets 857,506 958,357
Fair Value, Recurring Basis | Level 1 | Commercial paper    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 1 | Agency bonds    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 1 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 1 | U.S. government agency securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 1 | Treasury bills    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | 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 | Level 1 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 1 | Money market funds    
Financial Assets:    
Cash equivalents 688,722 958,357
Fair Value, Recurring Basis | Level 1 | Treasury bills    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Level 1 | Corporate debt securities    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 2    
Financial Assets:    
Cash equivalents 108,245 618,498
Marketable securities 4,356,446 2,004,410
Publicly held equity securities included in strategic investments 0  
Total financial assets 4,464,988 2,625,246
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 28,723 26,222
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 629,609 461,365
Fair Value, Recurring Basis | Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 280,927 466,256
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,027,509 834,665
Fair Value, Recurring Basis | Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 389,678 215,902
Fair Value, Recurring Basis | 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 | Level 2 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 2 | Money market funds    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Level 2 | Treasury bills    
Financial Assets:    
Cash equivalents 107,496 618,498
Fair Value, Recurring Basis | Level 2 | Corporate debt securities    
Financial Assets:    
Cash equivalents 749  
Fair Value, Recurring Basis | Level 3    
Financial Assets:    
Cash equivalents 0 0
Marketable securities 0 0
Publicly held equity securities included in strategic investments 0  
Total financial assets 14,231 5,130
Fair Value, Recurring Basis | Level 3 | Commercial paper    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 3 | Agency bonds    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 3 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 3 | U.S. government agency securities    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 3 | Treasury bills    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | 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 | Level 3 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 14,231 5,130
Fair Value, Recurring Basis | Level 3 | Money market funds    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Level 3 | Treasury bills    
Financial Assets:    
Cash equivalents 0 $ 0
Fair Value, Recurring Basis | Level 3 | Corporate debt securities    
Financial Assets:    
Cash equivalents $ 0