Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 30, 2025	Jan. 31, 2025
Assets:
Cash equivalents	$ 1,891,342	$ 2,251,140
Short-term investments	1,667,601	2,008,873
Long-term investments	956,144	656,476
Money market funds
Assets:
Cash equivalents	1,744,732	1,741,089
Time deposits
Assets:
Cash equivalents	108,022	113,851
Corporate notes and bonds
Assets:
Cash equivalents	30,641	4,466
U.S. government securities
Assets:
Cash equivalents	7,947	388,670
Commercial paper
Assets:
Cash equivalents		3,064
Recurring
Assets:
Marketable equity securities	9,365	13,833
Non-marketable debt securities	11,000	750
Derivative assets	11,002	1,579
Total assets	4,546,454	4,932,651
Liabilities:
Derivative liabilities	(5,475)	(1,639)
Total liabilities	(5,475)	(1,639)
Recurring | Corporate notes and bonds
Assets:
Short-term investments	1,121,368	1,059,181
Long-term investments	705,814	501,369
Recurring | U.S. government and agency securities
Assets:
Short-term investments	278,164	456,673
Long-term investments	250,330	153,065
Recurring | Commercial paper
Assets:
Short-term investments	160,471	307,856
Recurring | Certificates of deposit
Assets:
Short-term investments	107,598	185,163
Long-term investments		2,042
Recurring | Money market funds
Assets:
Cash equivalents	1,744,732	1,741,089
Recurring | Time deposits
Assets:
Cash equivalents	108,022	113,851
Recurring | Corporate notes and bonds
Assets:
Cash equivalents	30,641	4,466
Recurring | U.S. government securities
Assets:
Cash equivalents	7,947	388,670
Recurring | Commercial paper
Assets:
Cash equivalents		3,064
Recurring | Level 1
Assets:
Non-marketable debt securities	0	0
Derivative assets	0	0
Total assets	1,754,097	1,754,922
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
Recurring | Level 1 | Money market funds
Assets:
Cash equivalents	1,744,732	1,741,089
Recurring | Level 1 | Time deposits
Assets:
Cash equivalents	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Cash equivalents	0	0
Recurring | Level 1 | U.S. government securities
Assets:
Cash equivalents	0	0
Recurring | Level 1 | Commercial paper
Assets:
Cash equivalents		0
Recurring | Level 2
Assets:
Marketable equity securities	0	0
Non-marketable debt securities	0	0
Derivative assets	11,002	1,579
Total assets	2,781,357	3,176,979
Liabilities:
Derivative liabilities	(5,475)	(1,639)
Total liabilities	(5,475)	(1,639)
Recurring | Level 2 | Corporate notes and bonds
Assets:
Short-term investments	1,121,368	1,059,181
Long-term investments	705,814	501,369
Recurring | Level 2 | U.S. government and agency securities
Assets:
Short-term investments	278,164	456,673
Long-term investments	250,330	153,065
Recurring | Level 2 | Commercial paper
Assets:
Short-term investments	160,471	307,856
Recurring | Level 2 | Certificates of deposit
Assets:
Short-term investments	107,598	185,163
Long-term investments		2,042
Recurring | Level 2 | Money market funds
Assets:
Cash equivalents	0	0
Recurring | Level 2 | Time deposits
Assets:
Cash equivalents	108,022	113,851
Recurring | Level 2 | Corporate notes and bonds
Assets:
Cash equivalents	30,641	4,466
Recurring | Level 2 | U.S. government securities
Assets:
Cash equivalents	7,947	388,670
Recurring | Level 2 | Commercial paper
Assets:
Cash equivalents		3,064
Recurring | Level 3
Assets:
Marketable equity securities	0	0
Derivative assets	0	0
Total assets	11,000	750
Liabilities:
Derivative liabilities	0	0
Total liabilities	0	0
Recurring | Level 3 | Corporate notes and bonds
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 3 | U.S. government and agency securities
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 3 | Commercial paper
Assets:
Short-term investments	0	0
Recurring | Level 3 | Certificates of deposit
Assets:
Short-term investments	0	0
Long-term investments		0
Recurring | Level 3 | Money market funds
Assets:
Cash equivalents	0	0
Recurring | Level 3 | Time deposits
Assets:
Cash equivalents	0	0
Recurring | Level 3 | Corporate notes and bonds
Assets:
Cash equivalents	0	0
Recurring | Level 3 | U.S. government securities
Assets:
Cash equivalents	$ 0	0
Recurring | Level 3 | Commercial paper
Assets:
Cash equivalents		$ 0