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STOCKHOLDERS' EQUITY (Detail Textuals) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2015 | Jun. 30, 2014 | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015 | Dec. 31, 2015
Stockholders Equity [Line Items] |  |  |  |  |  |
Stock split of common stock | two-for-one |  |  |  |  |
Number of common share sold |  | 3,450,000 |  |  |  |
Number of shares sold to underwriters |  | 450,000 |  |  |  |
Public offering price per share (in dollars per share) |  | $ 38.82 |  |  |  |
Net proceed from offering |  | $ 128,700,000 |  |  | $ 128,686,000 |
Number of shares authorized to be repurchased under prior program |  |  |  |  |  | 3,750,000
Number of increased authorized shares to be repurchased |  |  |  |  |  | 5,000,000
Proceeds from exercise of stock options |  |  | $ 260,000 | $ 417,000 | 729,000 |
Long-Term Incentive Stock Plan |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Shares available for grant |  |  | 1,504,807 |  |  |
Restricted Stock Units (RSUs) | Long-Term Incentive Stock Plan |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Recognized compensation expense |  |  | $ 16,800,000 | 15,600,000 | 11,600,000 |
Unrecognized stock compensation related to unvested option awards |  |  | $ 40,700,000 | 42,000,000 | 32,200,000 |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting and exercise period of awards |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | Minimum | Long-Term Incentive Stock Plan |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting and exercise period of awards |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting and exercise period of awards |  |  | 5 years |  |  |
Restricted Stock Units (RSUs) | Maximum | Long-Term Incentive Stock Plan |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting and exercise period of awards |  |  | 5 years |  |  |
Stock Options |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Weighted average remaining term for stock options outstanding |  |  | 1 year 8 months 12 days |  |  |
Aggregate intrinsic value for stock options outstanding |  |  | $ 4,300,000 |  |  |
Proceeds from exercise of stock options |  |  | 260,000 | 417,000 |  |
Intrinsic value of stock options exercised |  |  | 936,000 | 1,700,000 |  |
Recognized compensation expense |  |  | $ 126,000 | $ 153,000 | $ 541,000 |
Stock Options | Maximum | Long-Term Incentive Stock Plan |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting and exercise period of awards |  |  | 10 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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