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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 6 Months Ended
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Jul. 31, 2024
CASH, CASH EQUIVALENTS AND INVESTMENTS |
Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | July 31, | ​ | January 31,
​ | ​ | 2024 |  | 2024
Short-term investments | ​ | $ | 69,292 | ​ | $ | 109,489
Available-for-sale securities | ​ | ​ | 182,705 | ​ | ​ | 105,884
Total investments | ​ | $ | 251,997 | ​ | $ | 215,373
Schedule of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | July 31, 2024
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 25,200 | ​ | $ | — | ​ | $ | 3 | ​ | $ | 94 | ​ | $ | 25,109
Due in one to three years | ​ | ​ | 91,045 | ​ | ​ | — | ​ | ​ | 449 | ​ | ​ | 202 | ​ | ​ | 91,292
Due in three to five years | ​ | ​ | 55,502 | ​ | ​ | — | ​ | ​ | 755 | ​ | ​ | — | ​ | ​ | 56,257
U.S. corporate debt security: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to three years | ​ | ​ | 10,046 | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | 10,047
Totals | ​ | $ | 181,793 | ​ | $ | — | ​ | $ | 1,208 | ​ | $ | 296 | ​ | $ | 182,705
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | January 31, 2024
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to three years | ​ | $ | 96,217 | ​ | $ | — | ​ | $ | 568 | ​ | $ | 230 | ​ | $ | 96,555
U.S. corporate debt security: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to three years | ​ | ​ | 9,406 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 77 | ​ | ​ | 9,329
Totals | ​ | $ | 105,623 | ​ | $ | — | ​ | $ | 568 | ​ | $ | 307 | ​ | $ | 105,884

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org/321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org/325/tableOfContent + Details
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