Marketable Securities - Additional Information (Detail) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
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Jan. 31, 2026
USD ($)
Security
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Jan. 31, 2025
USD ($)
Security
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Jan. 31, 2024
USD ($)
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Sales and maturities of marketable securities | $ 513,881 | $ 416,756 | $ 347,366 |
| Total number of securities with unrealized loss positions within the Company's portfolio | Security | 192 | 262 | |
| Interest income | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Net realized gain (loss) | $ 376 | $ 92 | 4 |
| Amortization of discounts and premiums, net | $ 4,250 | $ 7,772 | $ 4,338 |
| X | ||||||||||
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- 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
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- 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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- Definition Amount of cash inflow from sale, maturity, prepayment and call of 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
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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