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Stock-Based Compensation - Narrative (Detail) - USD ($)									3 Months Ended			9 Months Ended
	Oct. 03, 2016	Jul. 14, 2016	Oct. 01, 2015	Jul. 15, 2015	Mar. 03, 2015	Jun. 24, 2014	Jun. 25, 2013	Jul. 11, 2012	Jan. 29, 2017	Jul. 31, 2016	Aug. 02, 2015	Jan. 29, 2017	Jan. 31, 2016	Sep. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted									0			0
2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock authorized for issuance														1,200,000
Number of shares available for future equity based grants									959,942			959,942
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future equity based grants														0
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized compensation cost									$ 4,800,000			$ 4,800,000
Weighted average period over which unrecognized compensation cost is expected to be recognized												1 year 10 months 24 days
Performance Based Restricted Stock Units [Member] | Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense												$ 2,500,000	$ 1,900,000
Performance Based Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years		3 years		3 years	3 years	3 years
Closing price of common stock		$ 28		$ 32.23		$ 17.70	$ 17.12	$ 10.21
Performance Based Restricted Stock Units [Member] | Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years		3 years
Closing price of common stock												$ 33.80
Number of shares unvested									16,000			16,000
Performance Based Restricted Stock Units [Member] | Requisite Service Period for 16,000 Restricted Stock Units [Member] | Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period												28 months
Performance Based Restricted Stock Units [Member] | Fiscal Year 2015 [Member] | Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested										12,000
Weighted average fair value of vested shares										$ 345,000
Weighted average fair value of vested shares, per share										$ 28.77
Performance Based Restricted Stock Units [Member] | Fiscal Year 2014 [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested										37,192
Weighted average fair value of vested shares										$ 637,000
Weighted average fair value of vested shares, per share										$ 17.12
Performance Based Restricted Stock Units [Member] | Fiscal Year 2013 [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested											115,855
Weighted average fair value of vested shares											$ 1,200,000
Weighted average fair value of vested shares, per share											$ 10.21
Performance Based Restricted Stock Units [Member] | Maximum [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares granted		107,880		107,554		102,845	72,380	120,000
Performance Based Restricted Stock Units [Member] | Maximum [Member] | Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares granted		11,549		10,364	28,000
Incentive Stock Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options to purchase common stock outstanding									78,600			78,600
Number of options exercisable									78,600			78,600
Weighted average exercise price for options outstanding									$ 8.43			$ 8.43
Weighted average exercise price for options exercisable									$ 8.43			$ 8.43
Weighted average contractual term for options outstanding												7 months 6 days
Weighted average contractual term for options exercisable												7 months 6 days
Aggregate intrinsic value for options outstanding									$ 2,000,000			$ 2,000,000
Aggregate intrinsic value for options exercisable									$ 2,000,000			2,000,000
Aggregate intrinsic value for options exercised												$ 128,000.0	1,000,000
Number of unvested stock option									0			0
Unrecognized stock based compensation cost									$ 0			$ 0
Share-based compensation expense												0	0
Common Stock Awards [Member] | Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense												$ 143,000	95,000
Common Stock Awards [Member] | Outside Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares granted	4,800		3,000
Vesting period	0 days		0 days
Closing price of common stock	$ 29.80		$ 31.77
Time Vested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense													$ 0
Vesting period												4 months 15 days
Unrecognized stock based compensation cost									$ 14,000			$ 14,000
Time Vested Restricted Stock Units [Member] | Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense												$ 20,000
Time Vested Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares granted		1,200											0
Vesting period		11 months
Closing price of common stock		$ 28

X

- Definition

The weighted average fair value at the end of the reporting period 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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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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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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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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Net number of share options (or share units) granted during the period.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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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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