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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 6 Months Ended
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Jul. 31, 2025
CASH, CASH EQUIVALENTS AND INVESTMENTS |
Summary of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | July 31, | ​ | January 31,
​ | ​ | 2025 |  | 2025
Short-term investments | ​ | $ | 97,676 | ​ | $ | 153,129
Available-for-sale securities | ​ | ​ | 296,664 | ​ | ​ | 226,745
Total investments | ​ | $ | 394,340 | ​ | $ | 379,874
Schedule of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | July 31, 2025
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 60,809 | ​ | $ | — | ​ | $ | 33 | ​ | $ | 38 | ​ | $ | 60,804
Due in one to three years | ​ | ​ | 69,085 | ​ | ​ | — | ​ | ​ | 661 | ​ | ​ | 10 | ​ | ​ | 69,736
Due in three to five years | ​ | ​ | 165,059 | ​ | ​ | — | ​ | ​ | 1,534 | ​ | ​ | 469 | ​ | ​ | 166,124
Totals | ​ | $ | 294,953 | ​ | $ | — | ​ | $ | 2,228 | ​ | $ | 517 | ​ | $ | 296,664
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | January 31, 2025
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 50,676 | ​ | $ | — | ​ | $ | 126 | ​ | $ | 7 | ​ | $ | 50,795
Due in one to three years | ​ | ​ | 84,881 | ​ | ​ | — | ​ | ​ | 381 | ​ | ​ | 105 | ​ | ​ | 85,157
Due in three to five years | ​ | ​ | 91,599 | ​ | ​ | — | ​ | ​ | 124 | ​ | ​ | 930 | ​ | ​ | 90,793
Totals | ​ | $ | 227,156 | ​ | $ | — | ​ | $ | 631 | ​ | $ | 1,042 | ​ | $ | 226,745

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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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