Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2026	Jan. 31, 2026
Financial Assets:
Marketable securities	$ 6,317,729	$ 6,544,031
Privately held debt securities included in strategic investments	3,988	3,968
Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	513,119	763,410
Marketable securities	6,317,729	6,544,031
Privately held debt securities included in strategic investments	3,988	3,968
Total financial assets	6,834,836	7,311,409
U.S. government agency securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	2,651,480	5,383,887
Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	921,817	1,095,471
Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	2,111,509
Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	114,957	64,673
Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	517,966
Money market funds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	427,186	724,236
Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	9,987	16,876
Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	72,869
Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	3,077
Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents		22,298
Level 1 \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	427,186	724,236
Marketable securities	0	0
Privately held debt securities included in strategic investments	0	0
Total financial assets	427,186	724,236
Level 1 \| U.S. government agency securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0	0
Level 1 \| Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0	0
Level 1 \| Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0
Level 1 \| Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0	0
Level 1 \| Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0
Level 1 \| Money market funds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	427,186	724,236
Level 1 \| Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0	0
Level 1 \| Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0
Level 1 \| Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0
Level 1 \| Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents		0
Level 2 \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	85,933	39,174
Marketable securities	6,317,729	6,544,031
Privately held debt securities included in strategic investments	0	0
Total financial assets	6,403,662	6,583,205
Level 2 \| U.S. government agency securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	2,651,480	5,383,887
Level 2 \| Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	921,817	1,095,471
Level 2 \| Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	2,111,509
Level 2 \| Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	114,957	64,673
Level 2 \| Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	517,966
Level 2 \| Money market funds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0	0
Level 2 \| Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	9,987	16,876
Level 2 \| Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	72,869
Level 2 \| Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	3,077
Level 2 \| Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents		22,298
Level 3 \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0	0
Marketable securities	0	0
Privately held debt securities included in strategic investments	3,988	3,968
Total financial assets	3,988	3,968
Level 3 \| U.S. government agency securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0	0
Level 3 \| Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0	0
Level 3 \| Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities
Level 3 \| Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities	0	0
Level 3 \| Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Marketable securities
Level 3 \| Money market funds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0	0
Level 3 \| Treasury bills \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0	0
Level 3 \| Commercial paper \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	0
Level 3 \| Corporate and other debt securities \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	$ 0
Level 3 \| Agency bonds \| Fair Value, Recurring Basis
Financial Assets:
Cash equivalents		$ 0

Fair value portion of asset recognized for present right to economic benefit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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