Investments - Additional Information (Details) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Apr. 30, 2024 |
Apr. 30, 2023 |
Jan. 31, 2024 |
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Unrealized losses for securities in unrealized loss position for less than 12 months | $ 21,800,000 | $ 6,000,000 | |
| Unrealized losses for securities in unrealized loss position for 12 months or longer | 1,900,000 | $ 4,800,000 | |
| Available-for-sale, realized gain (loss) | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|