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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jan. 31, 2024
Jan. 31, 2023
Financial Assets:    
Marketable securities $ 5,404,233 $ 4,325,836
Commercial paper    
Financial Assets:    
Marketable securities 41,564 77,701
Agency bonds    
Financial Assets:    
Marketable securities 1,666,683 810,650
Corporate and other debt securities    
Financial Assets:    
Marketable securities 663,159 550,894
U.S. government agency securities    
Financial Assets:    
Marketable securities 3,004,842 2,861,215
Treasury bills    
Financial Assets:    
Marketable securities 27,985 25,376
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 974,599 310,571
Marketable securities 5,404,233 4,325,836
Publicly held equity securities included in strategic investments 23,160 171,975
Total financial assets 6,406,074 4,823,054
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 41,564 77,701
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 1,666,683 810,650
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 663,159 550,894
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,004,842 2,861,215
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 27,985 25,376
Fair Value, Recurring Basis | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 254 272
Fair Value, Recurring Basis | Privately held debt securities included in strategic investments    
Financial Assets:    
Marketable securities 3,828 14,400
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 851,100 310,571
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 100,629  
Fair Value, Recurring Basis | Corporate debt securities    
Financial Assets:    
Cash equivalents 2,715  
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Cash equivalents 20,155  
Fair Value, Recurring Basis | Level 1    
Financial Assets:    
Cash equivalents 851,100 310,571
Marketable securities 0 0
Publicly held equity securities included in strategic investments 23,160 171,975
Total financial assets 874,260 482,546
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 851,100 310,571
Fair Value, Recurring Basis | Level 1 | Treasury bills    
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 2    
Financial Assets:    
Cash equivalents 123,499 0
Marketable securities 5,404,233 4,325,836
Publicly held equity securities included in strategic investments 0 0
Total financial assets 5,527,986 4,326,108
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 41,564 77,701
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 1,666,683 810,650
Fair Value, Recurring Basis | Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 663,159 550,894
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 3,004,842 2,861,215
Fair Value, Recurring Basis | Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 27,985 25,376
Fair Value, Recurring Basis | Level 2 | Certificates of deposit included in other assets, noncurrent    
Financial Assets:    
Certificates of deposit included in other assets, noncurrent 254 272
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 100,629  
Fair Value, Recurring Basis | Level 2 | Corporate debt securities    
Financial Assets:    
Cash equivalents 2,715  
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
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 3,828 14,400
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 3,828 14,400
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  
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