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 | |