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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Jan. 31, 2024
Stock-Based Compensation Plans |
Schedule of estimated stock-based compensation expense recognized in condensed consolidated statement of operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | January 31, |  | January 31, |  | January 31,
Year Ended | ​ | 2024 | ​ | 2023 | ​ | 2022
Cost of revenues |  | 1,128 |  | 940 |  | 732
Sales and marketing |  | 5,197 |  | 2,468 |  | 3,060
Research and development |  | 2,138 |  | 1,788 |  | 1,419
General and administrative |  | 8,017 |  | 8,471 |  | 5,806
Effect on net income |  | 16,480 |  | 13,667 |  | 11,017
Schedule of weighted-average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | January 31, |  | January 31, |  | January 31,
Year Ended | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | ​ | ​ | ​
Expected dividend yield (%) |  | — |  | — | ​ | —
Expected volatility (%) |  | 30.8 |  | 29.2 | ​ | 27.8
Risk-free rate (%) |  | 3.2 |  | 2.4 | ​ | 0.7
Expected option life (years) |  | 5 |  | 5 | ​ | 5
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted- |  | ​
​ | ​ | Number of | ​ | Weighted- | ​ | Average | ​ | Aggregate
​ | ​ | Stock | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | Options | ​ | Exercise | ​ | Contractual | ​ | Value
​ | ​ | Outstanding | ​ | Price | ​ | Life (years) | ​ | (in millions)
Balance at January 31, 2022 | ​ | 1,319,279 | ​ | $ | 42.35 | ​ | 4.4 | ​ | $ | 41.5
Granted | ​ | 356,014 | ​ | $ | 61.09 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (63,890) | ​ | $ | 27.34 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (17,970) | ​ | $ | 52.98 | ​ | ​ | ​ | ​ | ​
Balance at January 31, 2023 |  | 1,593,433 | ​ | $ | 45.54 |  | 4.1 | ​ | $ | 45.7
Granted |  | 278,845 | ​ | $ | 79.80 |  |  | ​ |  |
Exercised |  | (285,808) | ​ | $ | 33.06 |  |  | ​ |  |
Forfeited |  | (17,919) | ​ | $ | 62.30 |  |  | ​ |  |
Balance at January 31, 2024 |  | 1,568,551 | ​ | $ | 52.31 |  | 3.9 | ​ | $ | 54.8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested or expected to vest at January 31, 2024 |  | 1,568,551 | ​ | $ | 52.31 |  | 3.9 | ​ | $ | 54.8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at January 31, 2024 |  | 1,121,998 | ​ | $ | 46.46 |  | 3.3 | ​ | $ | 45.7
Schedule of Non vested share activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant-Date
​ | ​ | Stock Options | ​ | Fair Value per
​ | ​ | Outstanding | ​ | Share
Balance at January 31, 2022 |  | 462,853 | ​ | $ | 13.16
Granted |  | 356,014 | ​ | $ | 18.47
Vested |  | (313,186) | ​ | $ | 13.72
Forfeited |  | (16,860) | ​ | $ | 3.71
Balance at January 31, 2023 |  | 488,821 | ​ | $ | 16.11
Granted |  | 278,845 | ​ | $ | 26.19
Vested |  | (303,628) | ​ | $ | 17.74
Forfeited |  | (17,485) | ​ | $ | 18.29
Balance at January 31, 2024 |  | 446,553 | ​ | $ | 20.67
Schedule of performance share units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |  | Weighted- |  | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | Number of | ​ | Granted | ​ | Remaining | ​ | Intrinsic
​ | ​ | PSUs | ​ | Date Fair | ​ | Contractual | ​ | Value
​ | ​ | Outstanding | ​ | Value | ​ | Life (years) | ​ | (in millions)
Balance at January 31, 2022 |  | 777,538 | ​ | $ | 35.76 |  | 4.8 | ​ | $ | 57.4
Granted |  | 97,991 | ​ | $ | 64.98 |  |  | ​ |  |
Performance units issued |  | 39,704 | ​ | $ | 54.34 |  |  | ​ |  |
Exercised | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Balance at January 31, 2023 |  | 915,233 | ​ | $ | 38.41 |  | 4.5 | ​ | $ | 67.9
Granted | ​ | 95,134 | ​ | $ | 105.96 | ​ | ​ | ​ | ​ | ​
Performance units issued | ​ | 68,005 | ​ | $ | 53.80 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (87,354) | ​ | $ | 14.29 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (2,475) | ​ | $ | 81.82 | ​ | ​ | ​ | ​ | ​
Balance at January 31, 2024 | ​ | 988,543 | ​ | $ | 53.81 | ​ | 4.5 | ​ | $ | 86.3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested or expected to vest at January 31, 2024 |  | 988,543 | ​ | $ | 53.81 |  | 4.5 | ​ | $ | 86.3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at January 31, 2024 |  | 720,452 | ​ | $ | 36.60 |  | 3.2 | ​ | $ | 62.8
Schedule of restricted share units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |  | Weighted- |  | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Intrinsic
​ | ​ | Number of | ​ | Granted | ​ | Remaining | ​ | Value
​ | ​ | RSUs | ​ | Date Fair | ​ | Contractual | ​ | (in
​ | ​ | Outstanding | ​ | Value | ​ | Life (years) | ​ | millions)
Balance at January 31, 2022 | ​ | 410,980 | ​ | $ | 29.17 | ​ | 5.0 | ​ | $ | 30.3
Granted | ​ | 63,651 | ​ | $ | 61.53 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Balance at January 31, 2023 |  | 474,631 | ​ | $ | 32.44 |  | 4.7 | ​ | $ | 35.2
Granted |  | 61,774 | ​ | $ | 79.89 |  |  | ​ |  |
Exercised | ​ | (53,898) | ​ | $ | 8.52 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (413) | ​ | $ | 60.66 | ​ | ​ | ​ | ​ | ​
Balance at January 31, 2024 |  | 482,094 | ​ | $ | 40.19 |  | 4.8 | ​ | $ | 42.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested or expected to vest at January 31, 2024 |  | 482,094 | ​ | $ | 40.19 |  | 4.8 | ​ | $ | 42.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at January 31, 2024 |  | 419,690 | ​ | $ | 35.32 |  | 4.3 | ​ | $ | 36.6
Schedule of cash settled restricted share unit plan activity | ​
​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Remaining
​ | ​ | CRSUs | ​ | Contractual
​ | ​ | Outstanding | ​ | Life (years)
Balance at January 31, 2022 |  | 24,428 |  | 1.4
Granted |  | 7,948 |  |
Vested and settled in cash |  | (17,719) |  |
Forfeited |  | (74) |  |
Balance at January 31, 2023 |  | 14,583 |  | 1.4
Granted | ​ | 7,879 | ​ | ​
Vested and settled in cash | ​ | (11,092) | ​ | ​
Balance at January 31, 2024 | ​ | 11,370 | ​ | 1.8
​ | ​ | ​ | ​ | ​
Non-vested at January 31, 2024 |  | 11,370 |  | 1.8

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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