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STOCKHOLDERS' EQUITY (Detail Textuals) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2015 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Stockholders Equity [Line Items] |  |  |  |
Stock split of common stock | two-for-one |  |  |
Number of shares authorized to be repurchased under prior program |  | 5,000,000 |  |
Proceeds from exercise of stock options |  | $ 1,578,000 | $ 260,000 | $ 417,000
Share-based compensation expense |  | $ 19,665,000 | 16,901,000 | 15,576,000
Long-Term Incentive Stock Plan |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Shares available for grant |  | 1,252,317 |  |
Restricted Stock Units (RSUs) | Long-Term Incentive Stock Plan |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Share-based compensation expense |  | $ 19,600,000 | 16,800,000 | 15,600,000
Unrecognized stock compensation related to unvested option awards |  | $ 23,000,000 | 40,700,000 | 42,000,000
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 | 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 |  | 2 years 3 months 18 days |  |
Aggregate intrinsic value for stock options outstanding |  | $ 1,600,000 |  |
Proceeds from exercise of stock options |  | 1,600,000 | 260,000 |
Intrinsic value of stock options exercised |  | $ 3,600,000 | 936,000 |
Share-based compensation expense |  |  | $ 126,000 | $ 153,000
Stock Options | Maximum |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Vesting and exercise period of awards |  | 10 years |  |

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- Definition Represents stock repurchase program number of shares authorized to be repurchased under prior program. + References No definition available. + Details
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- Definition Stockholders Equity [Line Items] + References No definition available. + Details
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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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