Fair Value Measurements (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Jan. 31, 2022 |
Financial Assets: | | |
Marketable securities | $ 4,318,974 | $ 4,356,446 |
Commercial paper | | |
Financial Assets: | | |
Marketable securities | 34,881 | 28,723 |
Agency bonds | | |
Financial Assets: | | |
Marketable securities | 594,397 | 629,609 |
Corporate and other debt securities | | |
Financial Assets: | | |
Marketable securities | 285,251 | 280,927 |
U.S. government agency securities | | |
Financial Assets: | | |
Marketable securities | 3,146,058 | 3,027,509 |
Fair Value, Recurring Basis | | |
Financial Assets: | | |
Cash equivalents | 1,151,957 | 796,967 |
Marketable securities | 4,318,974 | 4,356,446 |
Publicly held equity securities included in strategic investments | 133,013 | 168,784 |
Total financial assets | 5,618,562 | 5,336,725 |
Fair Value, Recurring Basis | Commercial paper | | |
Financial Assets: | | |
Marketable securities | 34,881 | 28,723 |
Fair Value, Recurring Basis | Agency bonds | | |
Financial Assets: | | |
Marketable securities | 594,397 | 629,609 |
Fair Value, Recurring Basis | Corporate and other debt securities | | |
Financial Assets: | | |
Marketable securities | 285,251 | 280,927 |
Fair Value, Recurring Basis | U.S. government agency securities | | |
Financial Assets: | | |
Marketable securities | 3,146,058 | 3,027,509 |
Fair Value, Recurring Basis | Treasury bills | | |
Financial Assets: | | |
Marketable securities | 258,387 | 389,678 |
Fair Value, Recurring Basis | Certificates of deposit | | |
Financial Assets: | | |
Certificates of deposit included in other assets, noncurrent | 274 | 297 |
Fair Value, Recurring Basis | Privately held debt securities included in strategic investments | | |
Financial Assets: | | |
Marketable securities | 14,344 | 14,231 |
Fair Value, Recurring Basis | Money market funds | | |
Financial Assets: | | |
Cash equivalents | 1,054,691 | 688,722 |
Fair Value, Recurring Basis | Treasury bills | | |
Financial Assets: | | |
Cash equivalents | 92,477 | 107,496 |
Fair Value, Recurring Basis | Corporate debt securities | | |
Financial Assets: | | |
Cash equivalents | 783 | 749 |
Fair Value, Recurring Basis | U.S. government agency securities | | |
Financial Assets: | | |
Cash equivalents | 4,006 | |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | | |
Financial Assets: | | |
Cash equivalents | 1,054,691 | 688,722 |
Marketable securities | 0 | 0 |
Publicly held equity securities included in strategic investments | 133,013 | 168,784 |
Total financial assets | 1,187,704 | 857,506 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Agency bonds | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Corporate and other debt securities | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | U.S. government agency securities | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Certificates of deposit | | |
Financial Assets: | | |
Certificates of deposit included in other assets, noncurrent | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Privately held debt securities included in strategic investments | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Money market funds | | |
Financial Assets: | | |
Cash equivalents | 1,054,691 | 688,722 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills | | |
Financial Assets: | | |
Cash equivalents | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Corporate debt securities | | |
Financial Assets: | | |
Cash equivalents | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | U.S. government agency securities | | |
Financial Assets: | | |
Cash equivalents | 0 | |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | | |
Financial Assets: | | |
Cash equivalents | 97,266 | 108,245 |
Marketable securities | 4,318,974 | 4,356,446 |
Publicly held equity securities included in strategic investments | | 0 |
Total financial assets | 4,416,514 | 4,464,988 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper | | |
Financial Assets: | | |
Marketable securities | 34,881 | 28,723 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds | | |
Financial Assets: | | |
Marketable securities | 594,397 | 629,609 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Corporate and other debt securities | | |
Financial Assets: | | |
Marketable securities | 285,251 | 280,927 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | U.S. government agency securities | | |
Financial Assets: | | |
Marketable securities | 3,146,058 | 3,027,509 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills | | |
Financial Assets: | | |
Marketable securities | 258,387 | 389,678 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Certificates of deposit | | |
Financial Assets: | | |
Certificates of deposit included in other assets, noncurrent | 274 | 297 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Privately held debt securities included in strategic investments | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Money market funds | | |
Financial Assets: | | |
Cash equivalents | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills | | |
Financial Assets: | | |
Cash equivalents | 92,477 | 107,496 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Corporate debt securities | | |
Financial Assets: | | |
Cash equivalents | 783 | 749 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | U.S. government agency securities | | |
Financial Assets: | | |
Cash equivalents | 4,006 | |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | | |
Financial Assets: | | |
Cash equivalents | 0 | 0 |
Marketable securities | 0 | 0 |
Publicly held equity securities included in strategic investments | | 0 |
Total financial assets | 14,344 | 14,231 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Agency bonds | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Corporate and other debt securities | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | U.S. government agency securities | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills | | |
Financial Assets: | | |
Marketable securities | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Certificates of deposit | | |
Financial Assets: | | |
Certificates of deposit included in other assets, noncurrent | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Privately held debt securities included in strategic investments | | |
Financial Assets: | | |
Marketable securities | 14,344 | 14,231 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Money market funds | | |
Financial Assets: | | |
Cash equivalents | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills | | |
Financial Assets: | | |
Cash equivalents | 0 | 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Corporate debt securities | | |
Financial Assets: | | |
Cash equivalents | 0 | $ 0 |
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | U.S. government agency securities | | |
Financial Assets: | | |
Cash equivalents | $ 0 | |