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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jul. 31, 2022
Jan. 31, 2022
Financial Assets:    
Marketable securities $ 4,582,708 $ 4,356,446
Commercial paper    
Financial Assets:    
Marketable securities 64,596 28,723
Agency bonds    
Financial Assets:    
Marketable securities 643,832 629,609
Corporate and other debt securities    
Financial Assets:    
Marketable securities 408,465 280,927
U.S. government agency securities    
Financial Assets:    
Marketable securities 3,384,243 3,027,509
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 587,393 796,967
Marketable securities 4,582,708 4,356,446
Publicly held equity securities included in strategic investments 139,908 168,784
Total financial assets 5,323,951 5,336,725
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 64,596 28,723
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 643,832 629,609
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 408,465 280,927
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,384,243 3,027,509
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 81,572 389,678
Fair Value, Recurring Basis | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 13,673 14,231
Fair Value, Recurring Basis | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 269 297
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 521,527 688,722
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 50 107,496
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Cash equivalents 670  
Fair Value, Recurring Basis | Corporate debt securities    
Financial Assets:    
Cash equivalents   749
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Cash equivalents 49,197  
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Cash equivalents 15,949  
Fair Value, Recurring Basis | Level 1    
Financial Assets:    
Cash equivalents 521,527 688,722
Marketable securities 0 0
Publicly held equity securities included in strategic investments 139,908 168,784
Total financial assets 661,435 857,506
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 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 0 0
Fair Value, Recurring Basis | Level 1 | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 0 0
Fair Value, Recurring Basis | Level 1 | Money market funds    
Financial Assets:    
Cash equivalents 521,527 688,722
Fair Value, Recurring Basis | Level 1 | Treasury bills    
Financial Assets:    
Cash equivalents 0 0
Fair Value, Recurring Basis | Level 1 | Commercial paper    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 1 | Corporate debt securities    
Financial Assets:    
Cash equivalents   0
Fair Value, Recurring Basis | Level 1 | U.S. government agency securities    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 1 | Agency bonds    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 2    
Financial Assets:    
Cash equivalents 65,866 108,245
Marketable securities 4,582,708 4,356,446
Publicly held equity securities included in strategic investments 0 0
Total financial assets 4,648,843 4,464,988
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 64,596 28,723
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 643,832 629,609
Fair Value, Recurring Basis | Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 408,465 280,927
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,384,243 3,027,509
Fair Value, Recurring Basis | Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 81,572 389,678
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 | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 269 297
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 50 107,496
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Cash equivalents 670  
Fair Value, Recurring Basis | Level 2 | Corporate debt securities    
Financial Assets:    
Cash equivalents   749
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Cash equivalents 49,197  
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Cash equivalents 15,949  
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 0
Total financial assets 13,673 14,231
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 | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 13,673 14,231
Fair Value, Recurring Basis | Level 3 | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 0 0
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 | Commercial paper    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 3 | Corporate debt securities    
Financial Assets:    
Cash equivalents   $ 0
Fair Value, Recurring Basis | Level 3 | U.S. government agency securities    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 3 | Agency bonds    
Financial Assets:    
Cash equivalents $ 0