Defined contribution plan employer discretionary contribution additional amount.

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Share based compensation arrangement by share based payment award maximum contractual period terms.

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- Definition

Share based compensation arrangement by share based payment award number of remaining shares authorized.

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- Definition

Share based compensation arrangement by share based payment award percentage of units granted to directors and vested on first anniversary of grant date.

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- Definition

Share based compensation arrangement by share based payment award percentage of units vested on third anniversary of grant date to employee.

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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.

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-Name Accounting Standards Codification

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-Section 50

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Aggregate number of common shares reserved for future issuance.

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-Name Accounting Standards Codification

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-SubTopic 10

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The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Number of share instruments newly issued under a share-based compensation plan.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Employee Benefit Plans - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended			1 Months Ended
	Jun. 04, 2013	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013	Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		$ 2,800,000	$ 2,800,000	$ 2,700,000
Maximum contractual terms	10 years
Options to purchase outstanding common stock		1,371,785	1,285,792		1,371,785
Restricted stock units outstanding		231,500	236,000		231,500
Shares reserved for future stock-based grants		1,094,570			1,094,570
Restricted stock units granted		97,000
Restricted stock units, fair value grant prices per share		$ 18.46
Maximum Employee Contribution Percent		6.00%
Percentage of Employee's Contribution Matched by Company		50.00%
Company's matching contributions		457,000	383,000	446,000
Company's additional contributions on behalf of employees		0	0	0
Company's matching contributions		52,000	62,000	65,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		1,300,000	1,300,000	1,300,000
Options exercise prices, Lower limit		$ 10.93
Options exercise prices, Upper limit		$ 18.46
Expected period to recognize unvested stock options as stock compensation expense		1 year
Restricted Stock Units Granted to Directors and Vested on First Anniversary of Grant Date		100.00%
Percentage of Restricted Stock Units Granted to Employees vested on Third Anniversary of Grant date		100.00%
Restricted stock units granted		97,000	104,000	94,000
Restricted stock units, fair value grant prices per share		$ 18.46	$ 15.79	$ 10.93
Unrecognized compensation expense related to RSUs		1,800,000			1,800,000
In Money Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase outstanding common stock		1,371,785			1,371,785
Intrinsic value of in-the-money options outstanding		14,900,000			14,900,000
Aggregate Intrinsic value options exercisable		12,300,000			12,300,000
Weighted average grant, fair values of options granted		$ 9.68	$ 9.51	$ 5.79
Intrinsic value of options exercised		200,000	2,600,000	400,000
Unrecognized stock compensation expense		$ 2,800,000			$ 2,800,000
Expected period to recognize unvested stock options as stock compensation expense					2 years 1 month 6 days
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock award		500,000			500,000
Payroll deduction of the fair market value		85.00%
Shares of common stock issued		19,062	19,478	30,545
Shares remaining under the original authorization		32,592
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock award	3,500,000
Options issued to employees, Vested term	4 years
Options exercise prices, Upper limit		$ 19.06
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options issued to employees, Vested term	3 years
Options exercise prices, Lower limit		$ 2.03