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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Jan. 31, 2023
Financial Assets:    
Marketable securities $ 4,566,845 $ 4,325,836
Commercial paper    
Financial Assets:    
Marketable securities 61,013 77,701
Agency bonds    
Financial Assets:    
Marketable securities 1,179,036 810,650
Corporate and other debt securities    
Financial Assets:    
Marketable securities 517,766 550,894
U.S. government agency securities    
Financial Assets:    
Marketable securities 2,738,753 2,861,215
Fair Value, Recurring Basis    
Financial Assets:    
Cash equivalents 569,316 310,571
Marketable securities 4,566,845 4,325,836
Publicly held equity securities included in strategic investments 167,694 171,975
Total financial assets 5,307,826 4,823,054
Fair Value, Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 61,013 77,701
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 1,179,036 810,650
Fair Value, Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 517,766 550,894
Fair Value, Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 2,738,753 2,861,215
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 70,277 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 3,717 14,400
Fair Value, Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 503,109 310,571
Fair Value, Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 7,535  
Fair Value, Recurring Basis | Corporate debt securities    
Financial Assets:    
Cash equivalents 257  
Fair Value, Recurring Basis | Agency bonds    
Financial Assets:    
Cash equivalents 58,415  
Fair Value, Recurring Basis | Level 1    
Financial Assets:    
Cash equivalents 503,109 310,571
Marketable securities 0 0
Publicly held equity securities included in strategic investments 167,694 171,975
Total financial assets 670,803 482,546
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 503,109 310,571
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 | Agency bonds    
Financial Assets:    
Cash equivalents 0  
Fair Value, Recurring Basis | Level 2    
Financial Assets:    
Cash equivalents 66,207 0
Marketable securities 4,566,845 4,325,836
Publicly held equity securities included in strategic investments 0 0
Total financial assets 4,633,306 4,326,108
Fair Value, Recurring Basis | Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 61,013 77,701
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 1,179,036 810,650
Fair Value, Recurring Basis | Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 517,766 550,894
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 2,738,753 2,861,215
Fair Value, Recurring Basis | Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 70,277 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 7,535  
Fair Value, Recurring Basis | Level 2 | Corporate debt securities    
Financial Assets:    
Cash equivalents 257  
Fair Value, Recurring Basis | Level 2 | Agency bonds    
Financial Assets:    
Cash equivalents 58,415  
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 3,717 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 3,717 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 | Agency bonds    
Financial Assets:    
Cash equivalents $ 0