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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jul. 31, 2022
Jan. 31, 2022
Assets, Fair Value Disclosure    
Cash equivalents: $ 678,178 $ 845,230
Short-term investments 3,046,477 2,766,364
Long-term investments 1,086,684 1,256,207
Money market funds    
Assets, Fair Value Disclosure    
Cash equivalents: 590,661 722,492
Commercial paper    
Assets, Fair Value Disclosure    
Cash equivalents: 71,821 77,794
Corporate notes and bonds    
Assets, Fair Value Disclosure    
Cash equivalents: 15,696 7,949
U.S. government and agency securities    
Assets, Fair Value Disclosure    
Cash equivalents:   36,995
Recurring    
Assets, Fair Value Disclosure    
Total 4,811,339 4,867,801
Recurring | Commercial paper    
Assets, Fair Value Disclosure    
Short-term investments 889,803 883,636
Recurring | Certificates of deposit    
Assets, Fair Value Disclosure    
Short-term investments 289,481 103,580
Long-term investments   397
Recurring | Corporate notes and bonds    
Assets, Fair Value Disclosure    
Short-term investments 1,729,751 1,662,436
Long-term investments 704,521 935,603
Recurring | U.S. government and agency securities    
Assets, Fair Value Disclosure    
Short-term investments 137,442 116,712
Long-term investments 382,163 320,207
Recurring | Money market funds    
Assets, Fair Value Disclosure    
Cash equivalents: 590,661 722,492
Recurring | Commercial paper    
Assets, Fair Value Disclosure    
Cash equivalents: 71,821 77,794
Recurring | Corporate notes and bonds    
Assets, Fair Value Disclosure    
Cash equivalents: 15,696 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 590,661 722,492
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: 590,661 722,492
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 4,220,678 4,145,309
Recurring | Level 2 | Commercial paper    
Assets, Fair Value Disclosure    
Short-term investments 889,803 883,636
Recurring | Level 2 | Certificates of deposit    
Assets, Fair Value Disclosure    
Short-term investments 289,481 103,580
Long-term investments   397
Recurring | Level 2 | Corporate notes and bonds    
Assets, Fair Value Disclosure    
Short-term investments 1,729,751 1,662,436
Long-term investments 704,521 935,603
Recurring | Level 2 | U.S. government and agency securities    
Assets, Fair Value Disclosure    
Short-term investments 137,442 116,712
Long-term investments 382,163 320,207
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: 71,821 77,794
Recurring | Level 2 | Corporate notes and bonds    
Assets, Fair Value Disclosure    
Cash equivalents: $ 15,696 7,949
Recurring | Level 2 | U.S. government and agency securities    
Assets, Fair Value Disclosure    
Cash equivalents:   $ 36,995