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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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Represents stock repurchase program number of shares authorized to be repurchased under prior program.

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Stockholders Equity [Line Items]

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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.

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-Name Accounting Standards Codification
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-SubTopic 10
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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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