Marketable Securities -Narrative (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Jan. 31, 2026
USD ($)
security
|
Jan. 31, 2025
USD ($)
security
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Jan. 31, 2024
USD ($)
|
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Investment income interest | $ 20,200,000 | $ 26,000,000.0 | $ 30,200,000 |
| Debt securities, available-for-sale, unrealized loss position, number of positions | security | 27 | 40 | |
| Unleased loss position | $ 125,700,000 | $ 140,000,000.0 | |
| Expected credit losses | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Amount of allowance for credit 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/2003/role/disclosureRef
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| 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
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| X | ||||||||||
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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| X | ||||||||||
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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