Fair Value Measurements (Details) - USD ($) $ in Thousands	Oct. 31, 2022	Jan. 31, 2022
Assets, Fair Value Disclosure
Cash equivalents:	$ 516,628	$ 845,230
Short-term investments	3,123,879	2,766,364
Long-term investments	943,081	1,256,207
Money market funds
Assets, Fair Value Disclosure
Cash equivalents:	425,221	722,492
Commercial paper
Assets, Fair Value Disclosure
Cash equivalents:	89,807	77,794
Corporate notes and bonds
Assets, Fair Value Disclosure
Cash equivalents:	1,600	7,949
U.S. government and agency securities
Assets, Fair Value Disclosure
Cash equivalents:		36,995
Recurring
Assets, Fair Value Disclosure
Total	4,583,588	4,867,801
Recurring | Commercial paper
Assets, Fair Value Disclosure
Short-term investments	779,117	883,636
Recurring | Certificates of deposit
Assets, Fair Value Disclosure
Short-term investments	405,839	103,580
Long-term investments		397
Recurring | Corporate notes and bonds
Assets, Fair Value Disclosure
Short-term investments	1,715,493	1,662,436
Long-term investments	583,864	935,603
Recurring | U.S. government and agency securities
Assets, Fair Value Disclosure
Short-term investments	223,430	116,712
Long-term investments	359,217	320,207
Recurring | Money market funds
Assets, Fair Value Disclosure
Cash equivalents:	425,221	722,492
Recurring | Commercial paper
Assets, Fair Value Disclosure
Cash equivalents:	89,807	77,794
Recurring | Corporate notes and bonds
Assets, Fair Value Disclosure
Cash equivalents:	1,600	7,949
Recurring | U.S. government and agency securities
Assets, Fair Value Disclosure
Cash equivalents:		36,995
Recurring | Level 1
Assets, Fair Value Disclosure
Total	425,221	722,492
Recurring | Level 1 | Commercial paper
Assets, Fair Value Disclosure
Short-term investments	0	0
Recurring | Level 1 | Certificates of deposit
Assets, Fair Value Disclosure
Short-term investments	0	0
Long-term investments		0
Recurring | Level 1 | Corporate notes and bonds
Assets, Fair Value Disclosure
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | U.S. government and agency securities
Assets, Fair Value Disclosure
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | Money market funds
Assets, Fair Value Disclosure
Cash equivalents:	425,221	722,492
Recurring | Level 1 | Commercial paper
Assets, Fair Value Disclosure
Cash equivalents:	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets, Fair Value Disclosure
Cash equivalents:	0	0
Recurring | Level 1 | U.S. government and agency securities
Assets, Fair Value Disclosure
Cash equivalents:		0
Recurring | Level 2
Assets, Fair Value Disclosure
Total	4,158,367	4,145,309
Recurring | Level 2 | Commercial paper
Assets, Fair Value Disclosure
Short-term investments	779,117	883,636
Recurring | Level 2 | Certificates of deposit
Assets, Fair Value Disclosure
Short-term investments	405,839	103,580
Long-term investments		397
Recurring | Level 2 | Corporate notes and bonds
Assets, Fair Value Disclosure
Short-term investments	1,715,493	1,662,436
Long-term investments	583,864	935,603
Recurring | Level 2 | U.S. government and agency securities
Assets, Fair Value Disclosure
Short-term investments	223,430	116,712
Long-term investments	359,217	320,207
Recurring | Level 2 | Money market funds
Assets, Fair Value Disclosure
Cash equivalents:	0	0
Recurring | Level 2 | Commercial paper
Assets, Fair Value Disclosure
Cash equivalents:	89,807	77,794
Recurring | Level 2 | Corporate notes and bonds
Assets, Fair Value Disclosure
Cash equivalents:	$ 1,600	7,949
Recurring | Level 2 | U.S. government and agency securities
Assets, Fair Value Disclosure
Cash equivalents:		$ 36,995