Fair Value Measurements (Details) - USD ($) $ in Thousands	Jan. 31, 2026	Jan. 31, 2025
Financial Assets:
Cash equivalents	$ 763,410	$ 867,001
Marketable securities	6,544,031	6,442,329
Publicly held equity securities included in strategic investments		35,280
Privately held debt securities included in strategic investments	3,968	4,450
Total financial assets	7,311,409	7,349,060
Commercial paper
Financial Assets:
Marketable securities		20,841
Agency bonds
Financial Assets:
Marketable securities	1,095,471	1,174,484
Corporate and other debt securities
Financial Assets:
Marketable securities		720,795
U.S. government agency securities
Financial Assets:
Marketable securities	5,383,887	4,415,930
Treasury bills
Financial Assets:
Marketable securities	64,673	110,279
Money market funds
Financial Assets:
Cash equivalents	724,236	825,044
Treasury bills
Financial Assets:
Cash equivalents	16,876	17,965
Agency bonds
Financial Assets:
Cash equivalents	22,298	23,992
Level 1
Financial Assets:
Cash equivalents	724,236	825,044
Marketable securities	0	0
Publicly held equity securities included in strategic investments		35,280
Privately held debt securities included in strategic investments	0	0
Total financial assets	724,236	860,324
Level 1 | Commercial paper
Financial Assets:
Marketable securities		0
Level 1 | Agency bonds
Financial Assets:
Marketable securities	0	0
Level 1 | Corporate and other debt securities
Financial Assets:
Marketable securities		0
Level 1 | U.S. government agency securities
Financial Assets:
Marketable securities	0	0
Level 1 | Treasury bills
Financial Assets:
Marketable securities	0	0
Level 1 | Money market funds
Financial Assets:
Cash equivalents	724,236	825,044
Level 1 | Treasury bills
Financial Assets:
Cash equivalents	0	0
Level 1 | Agency bonds
Financial Assets:
Cash equivalents	0	0
Level 2
Financial Assets:
Cash equivalents	39,174	41,957
Marketable securities	6,544,031	6,442,329
Publicly held equity securities included in strategic investments		0
Privately held debt securities included in strategic investments	0	0
Total financial assets	6,583,205	6,484,286
Level 2 | Commercial paper
Financial Assets:
Marketable securities		20,841
Level 2 | Agency bonds
Financial Assets:
Marketable securities	1,095,471	1,174,484
Level 2 | Corporate and other debt securities
Financial Assets:
Marketable securities		720,795
Level 2 | U.S. government agency securities
Financial Assets:
Marketable securities	5,383,887	4,415,930
Level 2 | Treasury bills
Financial Assets:
Marketable securities	64,673	110,279
Level 2 | Money market funds
Financial Assets:
Cash equivalents	0	0
Level 2 | Treasury bills
Financial Assets:
Cash equivalents	16,876	17,965
Level 2 | Agency bonds
Financial Assets:
Cash equivalents	22,298	23,992
Level 3
Financial Assets:
Cash equivalents	0	0
Marketable securities	0	0
Publicly held equity securities included in strategic investments		0
Privately held debt securities included in strategic investments	3,968	4,450
Total financial assets	3,968	4,450
Level 3 | Commercial paper
Financial Assets:
Marketable securities		0
Level 3 | Agency bonds
Financial Assets:
Marketable securities	0	0
Level 3 | Corporate and other debt securities
Financial Assets:
Marketable securities		0
Level 3 | U.S. government agency securities
Financial Assets:
Marketable securities	0	0
Level 3 | Treasury bills
Financial Assets:
Marketable securities	0	0
Level 3 | Money market funds
Financial Assets:
Cash equivalents	0	0
Level 3 | Treasury bills
Financial Assets:
Cash equivalents	0	0
Level 3 | Agency bonds
Financial Assets:
Cash equivalents	$ 0	$ 0