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Cash Equivalents and Investments - Schedule of Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) - USD ($) | Jan. 31, 2025 | Jan. 31, 2024
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Cash Equivalents, Fair Value |  |
Less than 12 months, fair value |  | $ 338,893,000
12 months or greater, fair value |  | 0
Total, fair value |  | 338,893,000
Cash Equivalents, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (2,000)
12 months or greater, accumulated losses |  | 0
Total, accumulated losses |  | (2,000)
Investments, Fair Value |  |
Less than 12 months, fair value |  | 1,395,409,000
12 months or greater, fair value |  | 513,815,000
Total, fair value |  | 1,909,224,000
Investments, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (2,728,000)
12 months or greater, accumulated losses |  | (5,465,000)
Total, accumulated losses |  | (8,193,000)
Cash Equivalents And Debt Securities, Available-For-Sale [Abstract] |  |
Less than 12 months, fair value |  | 1,734,302,000
12 months or greater, fair value |  | 513,815,000
Total, fair value |  | 2,248,117,000
Cash Equivalents And Debt Securities, Available-For-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, accumulated losses |  | (2,730,000)
12 months or greater, accumulated losses |  | (5,465,000)
Total, accumulated losses | $ 0 | (8,195,000)
Corporate notes and bonds |  |
Investments, Fair Value |  |
Less than 12 months, fair value |  | 625,766,000
12 months or greater, fair value |  | 321,952,000
Total, fair value |  | 947,718,000
Investments, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (1,259,000)
12 months or greater, accumulated losses |  | (2,135,000)
Total, accumulated losses |  | (3,394,000)
U.S. government and agency securities |  |
Investments, Fair Value |  |
Less than 12 months, fair value |  | 525,408,000
12 months or greater, fair value |  | 191,863,000
Total, fair value |  | 717,271,000
Investments, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (1,323,000)
12 months or greater, accumulated losses |  | (3,330,000)
Total, accumulated losses |  | (4,653,000)
Commercial paper |  |
Investments, Fair Value |  |
Less than 12 months, fair value |  | 172,422,000
12 months or greater, fair value |  | 0
Total, fair value |  | 172,422,000
Investments, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (131,000)
12 months or greater, accumulated losses |  | 0
Total, accumulated losses |  | (131,000)
Certificates of deposit |  |
Investments, Fair Value |  |
Less than 12 months, fair value |  | 71,813,000
12 months or greater, fair value |  | 0
Total, fair value |  | 71,813,000
Investments, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (15,000)
12 months or greater, accumulated losses |  | 0
Total, accumulated losses |  | (15,000)
U.S. government securities |  |
Cash Equivalents, Fair Value |  |
Less than 12 months, fair value |  | 338,893,000
12 months or greater, fair value |  | 0
Total, fair value |  | 338,893,000
Cash Equivalents, Gross Unrealized Losses |  |
Less than 12 months, accumulated losses |  | (2,000)
12 months or greater, accumulated losses |  | 0
Total, accumulated losses |  | $ (2,000)

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