Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Jan. 31, 2024
Assets:
Cash equivalents:	$ 2,251,140	$ 1,331,708
Short-term investments	2,008,873	2,083,499
Long-term investments	$ 656,476	$ 916,307
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid expenses and other current assets	Prepaid expenses and other current assets
Liabilities:
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Money market funds
Assets:
Cash equivalents:	$ 1,741,089	$ 533,211
U.S. government securities
Assets:
Cash equivalents:	388,670	742,234
Time deposits
Assets:
Cash equivalents:	113,851	56,263
Corporate notes and bonds
Assets:
Cash equivalents:	4,466
Commercial paper
Assets:
Cash equivalents:	3,064
Recurring
Assets:
Derivative assets	1,579	60
Total assets	4,918,068	4,331,574
Liabilities:
Derivative liabilities	(1,639)	(745)
Total liabilities	(1,639)	(745)
Recurring | Corporate notes and bonds
Assets:
Short-term investments	1,059,181	939,727
Long-term investments	501,369	607,989
Recurring | U.S. government and agency securities
Assets:
Short-term investments	456,673	573,780
Long-term investments	153,065	299,637
Recurring | Commercial paper
Assets:
Short-term investments	307,856	353,548
Recurring | Certificates of deposit
Assets:
Short-term investments	185,163	216,444
Long-term investments	2,042	8,681
Recurring | Money market funds
Assets:
Cash equivalents:	1,741,089	533,211
Recurring | U.S. government securities
Assets:
Cash equivalents:	388,670	742,234
Recurring | Time deposits
Assets:
Cash equivalents:	113,851	56,263
Recurring | Corporate notes and bonds
Assets:
Cash equivalents:	4,466
Recurring | Commercial paper
Assets:
Cash equivalents:	3,064
Recurring | Level 1
Assets:
Derivative assets	0	0
Total assets	1,741,089	533,211
Liabilities:
Derivative liabilities	0	0
Total liabilities	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | U.S. government and agency securities
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | Commercial paper
Assets:
Short-term investments	0	0
Recurring | Level 1 | Certificates of deposit
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | Money market funds
Assets:
Cash equivalents:	1,741,089	533,211
Recurring | Level 1 | U.S. government securities
Assets:
Cash equivalents:	0	0
Recurring | Level 1 | Time deposits
Assets:
Cash equivalents:	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Cash equivalents:	0
Recurring | Level 1 | Commercial paper
Assets:
Cash equivalents:	0
Recurring | Level 2
Assets:
Derivative assets	1,579	60
Total assets	3,176,979	3,798,363
Liabilities:
Derivative liabilities	(1,639)	(745)
Total liabilities	(1,639)	(745)
Recurring | Level 2 | Corporate notes and bonds
Assets:
Short-term investments	1,059,181	939,727
Long-term investments	501,369	607,989
Recurring | Level 2 | U.S. government and agency securities
Assets:
Short-term investments	456,673	573,780
Long-term investments	153,065	299,637
Recurring | Level 2 | Commercial paper
Assets:
Short-term investments	307,856	353,548
Recurring | Level 2 | Certificates of deposit
Assets:
Short-term investments	185,163	216,444
Long-term investments	2,042	8,681
Recurring | Level 2 | Money market funds
Assets:
Cash equivalents:	0	0
Recurring | Level 2 | U.S. government securities
Assets:
Cash equivalents:	388,670	742,234
Recurring | Level 2 | Time deposits
Assets:
Cash equivalents:	113,851	$ 56,263
Recurring | Level 2 | Corporate notes and bonds
Assets:
Cash equivalents:	4,466
Recurring | Level 2 | Commercial paper
Assets:
Cash equivalents:	$ 3,064