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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Apr. 30, 2024
Jan. 31, 2024
Financial Assets:    
Marketable securities $ 5,488,737 $ 5,404,233
Commercial paper    
Financial Assets:    
Marketable securities 19,737 41,564
Agency bonds    
Financial Assets:    
Marketable securities 1,746,249 1,666,683
Corporate and other debt securities    
Financial Assets:    
Marketable securities 649,789 663,159
U.S. government agency securities    
Financial Assets:    
Marketable securities 3,018,280 3,004,842
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 1,400,951 974,599
Marketable securities 5,488,737 5,404,233
Publicly held equity securities included in strategic investments 24,200 23,160
Total financial assets 6,918,005 6,406,074
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 19,737 41,564
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 1,746,249 1,666,683
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 649,789 663,159
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,018,280 3,004,842
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 54,682 27,985
Fair Value, Recurring Basis | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 253 254
Fair Value, Recurring Basis | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 3,864 3,828
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 1,347,656 851,100
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 40,325 100,629
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Cash equivalents 9,466  
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Cash equivalents 3,504  
Fair Value, Recurring Basis | Corporate debt securities    
Financial Assets:    
Cash equivalents   2,715
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Cash equivalents   20,155
Fair Value, Recurring Basis | Level 1    
Financial Assets:    
Cash equivalents 1,347,656 851,100
Marketable securities 0 0
Publicly held equity securities included in strategic investments 24,200 23,160
Total financial assets 1,371,856 874,260
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 included in other assets, noncurrent    
Financial Assets:    
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 1,347,656 851,100
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 | U.S. government agency securities    
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 | Agency bonds    
Financial Assets:    
Cash equivalents   0
Fair Value, Recurring Basis | Level 2    
Financial Assets:    
Cash equivalents 53,295 123,499
Marketable securities 5,488,737 5,404,233
Publicly held equity securities included in strategic investments 0 0
Total financial assets 5,542,285 5,527,986
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 19,737 41,564
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 1,746,249 1,666,683
Fair Value, Recurring Basis | Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 649,789 663,159
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,018,280 3,004,842
Fair Value, Recurring Basis | Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 54,682 27,985
Fair Value, Recurring Basis | Level 2 | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 253 254
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 40,325 100,629
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Cash equivalents 9,466  
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Cash equivalents 3,504  
Fair Value, Recurring Basis | Level 2 | Corporate debt securities    
Financial Assets:    
Cash equivalents   2,715
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Cash equivalents   20,155
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 3,864 3,828
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 included in other assets, noncurrent    
Financial Assets:    
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 3,864 3,828
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 | U.S. government agency securities    
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 | Agency bonds    
Financial Assets:    
Cash equivalents   $ 0