Marketable Securities (Tables)
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3 Months Ended |
Apr. 30, 2024 |
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| Investments, Debt and Equity Securities [Abstract] |
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| Components of Marketable Securities |
Marketable securities consist of the following for the periods presented (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | April 30, 2024 | | Cost or Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Total Estimated Fair Value | | U.S. government securities | $ | 319,622 | | | $ | — | | | $ | (1,915) | | | $ | 317,707 | | | Foreign securities | 6,347 | | | 7 | | | (45) | | | 6,309 | | | Corporate debt securities | 85,228 | | | 31 | | | (318) | | | 84,941 | | | Total | $ | 411,197 | | | $ | 38 | | | $ | (2,278) | | | $ | 408,957 | |
| | | | | | | | | | | | | | | | | | | | | | | | | January 31, 2024 | | Cost or Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Total Estimated Fair Value | | U.S. government securities | $ | 319,343 | | | $ | 782 | | | $ | (1,168) | | | $ | 318,957 | | | Foreign securities | 6,349 | | | 31 | | | (13) | | | 6,367 | | | Corporate debt securities | 82,368 | | | 340 | | | (134) | | | 82,574 | | | Total | $ | 408,060 | | | $ | 1,153 | | | $ | (1,315) | | | $ | 407,898 | |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value |
The following table summarizes the fair value and gross unrealized losses aggregated by category of individual securities that have been in a continuous unrealized loss position for greater than 12 months (in thousands):
| | | | | | | | | | | | | April 30, 2024 | | Continuous Unrealized Loss for Greater than 12 months | | Estimated Fair Value | | Gross Unrealized Losses | | U.S. government securities | $ | 76,134 | | | $ | (315) | | | Foreign securities | 1,328 | | | (8) | | | Corporate debt securities | 6,477 | | | (20) | | | Total | $ | 83,939 | | | $ | (343) | |
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| Marketable Securities by Contractual Maturity |
The contractual maturities of the investments classified as available-for-sale marketable securities are as follows (in thousands): | | | | | | | | | | | | | April 30, 2024 | | Amortized Cost | | Estimated Fair Value | | Due within 1 year | $ | 189,065 | | | $ | 187,947 | | | Due in 1 year through 5 years | 222,132 | | | 221,010 | | | Total | $ | 411,197 | | | $ | 408,957 | |
| | | | | | | | | | | | | January 31, 2024 | | Amortized Cost | | Estimated Fair Value | | Due within 1 year | $ | 173,481 | | | $ | 172,520 | | | Due in 1 year through 5 years | 234,579 | | | 235,378 | | | Total | $ | 408,060 | | | $ | 407,898 | |
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| Investment Income |
| | | | | | | | | | | | | Three Months Ended
April 30, | | 2024 | | 2023 | | Interest income | $ | 4,160 | | | $ | 2,928 | | Accretion/amortization of discount/premium, net | 487 | | | 471 | | | Investment income | $ | 4,647 | | | $ | 3,399 | |
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