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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jan. 31, 2020
Stockholders' Equity Note [Abstract] |
Schedule of restricted stock | Restricted Stock Units and Performance Based Restricted Stock Units ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Restricted Stock Units | ​ | Performance Based Restricted Stock Units
​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | Weighted Average
​ | Awards | ​ | Grant Date | ​ | Awards | ​ | Grant Date
​ | Outstanding |  | Fair Value | ​ | Outstanding |  | Fair Value
Unvested as of January 31, 2017 | 435,102 | ​ | $ | 30.36 | ​ | 1,599,472 | ​ | $ | 30.32
Granted | 52,891 | ​ | $ | 26.83 | ​ | 190,875 | ​ | $ | 13.36
Vested | (150,588) | ​ | $ | 28.75 | ​ | (344,784) | ​ | $ | 25.35
Cancelled | (10,391) | ​ | $ | 28.42 | ​ | — | ​ | $ | —
Unvested as of January 31, 2018 | 327,014 | ​ | $ | 30.59 | ​ | 1,445,563 | ​ | $ | 29.26
Granted | 137,723 | ​ | $ | 38.32 | ​ | 391,530 | ​ | $ | 30.23
Vested | (159,663) | ​ | $ | 30.38 | ​ | (292,266) | ​ | $ | 25.91
Cancelled | (23,249) | ​ | $ | 29.69 | ​ | (5,033) | ​ | $ | 27.10
Unvested as of January 31, 2019 | 281,825 | ​ | $ | 34.56 | ​ | 1,539,794 | ​ | $ | 30.15
Granted | 142,594 | ​ | $ | 37.74 | ​ | 332,651 | ​ | $ | 35.77
Vested | (168,781) | ​ | $ | 32.32 | ​ | (810,655) | ​ | $ | 24.58
Cancelled | (12,695) | ​ | $ | 35.09 | ​ | (3,080) | ​ | $ | 42.41
Unvested as of January 31, 2020 | 242,943 | ​ | $ | 37.95 | ​ | 1,058,710 | ​ | $ | 36.15
​
Schedule of information regarding stock options | Stock Options ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ |  | Shares |  | Exercise |  | Shares |  | Exercise |  | Shares |  | Exercise
Stock options outstanding at beginning of year | ​ | 55,311 | ​ | $ | 15.70 | ​ | 62,666 | ​ | $ | 11.50 | ​ | 251,131 | ​ | $ | 9.16
Exercised | ​ | (13,200) | ​ | $ | 8.71 | ​ | (15,600) | ​ | $ | 6.55 | ​ | (188,465) | ​ | $ | 8.38
Granted | ​ | — | ​ | $ | — | ​ | 8,245 | ​ | $ | 30.32 | ​ | — | ​ | $ | —
Cancelled or forfeited | ​ | (2,800) | ​ | $ | 9.20 | ​ | — | ​ | $ | — | ​ | — | ​ | $ | —
Stock options outstanding at end of year | ​ | 39,311 | ​ | $ | 18.51 | ​ | 55,311 | ​ | $ | 15.70 | ​ | 62,666 | ​ | $ | 11.50
Exercisable | ​ | 35,188 | ​ | $ | 17.12 | ​ | 47,066 | ​ | $ | 13.14 | ​ | 62,666 | ​ | $ | 11.50
Schedule of information about stock options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number | ​ | Weighted | ​ | Weighted | ​ | Number | ​ | Weighted
​ | ​ | Outstanding as of | ​ | Average | ​ | Average | ​ | Exercisable as of | ​ | Average
​ | ​ | January 31, | ​ | Remaining | ​ | Exercise | ​ | January 31, | ​ | Exercise
Range of Exercise Prices |  | 2020 |  | Contractual Life |  | Price |  | 2020 |  | Price
$12.51 - $17.45 | ​ | 21,066 | ​ | 0.56 | ​ | $ | 14.07 | ​ | 21,066 | ​ | $ | 14.07
$18.11 - $30.32 | ​ | 18,245 | ​ | 2.51 | ​ | $ | 23.63 | ​ | 14,122 | ​ | $ | 21.67
​ | ​ | 39,311 | ​ | ​ | ​ | ​ | ​ | ​ | 35,188 | ​ | ​ | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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