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Stock-Based Compensation - Narrative (Detail) - USD ($)				3 Months Ended
	Jul. 30, 2017	Jul. 13, 2017	Jul. 14, 2016	Jul. 30, 2017	Jul. 31, 2016	Sep. 16, 2015
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	895,623			895,623
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	$ 5,300,000			$ 5,300,000
Weighted average period over which unrecognized compensation cost is expected to be recognized				2 years 1 month 6 days
Incentive Stock Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted				0
Number of options to purchase common stock outstanding	15,000			15,000
Number of options exercisable	15,000			15,000
Weighted average exercise price for options outstanding	$ 7.08			$ 7.08
Weighted average exercise price for options exercisable	$ 7.08			$ 7.08
Weighted average contractual term for options outstanding	10 months 25 days
Weighted average contractual term for options exercisable	10 months 25 days
Aggregate intrinsic value for options outstanding	$ 354,000			$ 354,000
Aggregate intrinsic value for options exercisable	$ 354,000			354,000
Aggregate intrinsic value for options exercised				$ 14,000	$ 43,000
Number of unvested stock options	0			0
Unrecognized compensation cost related to incentive stock options	$ 0			$ 0
Share-based compensation expense				0	0
Time Vested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized compensation cost	$ 37,000			$ 37,000
Vesting Period				10 months 15 days
Selling, General and Administrative Expenses [Member] | Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 751,000	$ 761,000
Selling, General and Administrative Expenses [Member] | Time Vested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 6,000
Employee [Member] | Time Vested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted		1,200	1,200
Closing price of common stock		$ 32.50	$ 28
Vesting Period		11 months	11 months
Number of shares vested				1,200
Weighted average fair value of vested shares				$ 34,000
Weighted average fair value of vested shares, per share				$ 28

X

- 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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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 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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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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