The number of individuals who were granted stock awards.

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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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Unrecognized cost of unvested share-based compensation awards.

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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 options awarded to employees as compensation.

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No definition available.

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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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 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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

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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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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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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No definition available.

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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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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

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

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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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- Definition

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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of non-vested options outstanding.

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No definition available.

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Stock-Based Compensation - Narrative (Detail)									12 Months Ended
Stock-Based Compensation - Narrative (Detail)	May. 03, 2015 USD ($) $ / shares shares	Mar. 03, 2015 shares	Oct. 01, 2014 $ / shares shares	Jun. 24, 2014 $ / shares shares	Oct. 01, 2013 $ / shares shares	Jun. 25, 2013 $ / shares shares	Oct. 08, 2012 $ / shares shares	Jul. 11, 2012 $ / shares shares	May. 03, 2015 USD ($) $ / shares shares	Apr. 27, 2014 USD ($) $ / shares shares	Apr. 28, 2013 USD ($) $ / shares shares	May. 02, 2010 ExecutiveOfficers $ / shares shares	May. 03, 2009 $ / shares shares	Apr. 29, 2012 shares	Sep. 20, 2007 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted											2,000
2007 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	577,799								577,799
2002 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future equity based grants															0
Common Stock Awards [Member] \| Outside Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period
Number of shares granted			3,000		3,000		1,658
Closing price of common stock \| $ / shares			$ 17.95		$ 18.84		$ 12.13
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 \| $									$ 55,000	$ 57,000	$ 20,000
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years		3 years		3 years
Closing price of common stock \| $ / shares				$ 17.70		$ 17.12		$ 10.21
Remaining unrecognized compensation cost \| $	$ 1,200,000								$ 1,200,000
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] \| Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of common stock \| $ / shares	$ 26.02
Performance Based Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted				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]
Number of shares granted		28,000
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 \| $									$ 727,000	$ 581,000	$ 340,000
Performance Based Restricted Stock Units [Member] \| First Requisite Service Period [Member] \| Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		16 months
Performance Based Restricted Stock Units [Member] \| First Requisite Service Period [Member] \| Maximum [Member] \| Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted		12,000
Performance Based Restricted Stock Units [Member] \| Second Requisite Service Period [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] \| Second Requisite Service Period [Member] \| Maximum [Member] \| Non-employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted		16,000
Time Vested Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted									0	0	0
Weighted average fair value of vested shares, per share \| $ / shares									$ 4.17	$ 4.04	$ 3.76
Number of shares vested									61,668	61,667	61,665
Weighted average fair value of vested shares \| $									$ 257,000	$ 249,000	$ 232,000
Number of shares outstanding and unvested	0								0	61,668	123,335			185,000
Weighted average fair value of outstanding and unvested shares, per share \| $ / shares										$ 4.17
Remaining unrecognized compensation cost \| $	$ 0								$ 0
Time Vested Restricted Stock Awards [Member] \| Granted on July 1, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding and unvested										26,668
Time Vested Restricted Stock Awards [Member] \| Granted on January 7, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted													115,000
Vesting description									Vested in equal one-third installments on May 1, 2012, 2013, and 2014
Number of shares outstanding and unvested										35,000
Time Vested Restricted Stock Awards [Member] \| Non-employee [Member] \| Granted on January 7, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted													10,000
Time Vested Restricted Stock Awards [Member] \| Executive Officer [Member] \| Granted on July 1, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted time vested restricted common stock \| ExecutiveOfficers												2
Number of shares granted												80,000
Vesting description									Vested in equal one-third installments on July 1, 2012, 2013, and 2014
Closing price of common stock \| $ / shares												$ 5.08
Time Vested Restricted Stock Awards [Member] \| Key management employees [Member] \| Granted on January 7, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted													105,000
Closing price of common stock \| $ / shares													$ 1.88
Time Vested Restricted Stock Awards [Member] \| Selling, general and administrative expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $									$ 4,000	$ 62,000	$ 140,000
Time Vested Restricted Stock Awards [Member] \| Vesting on May 1, 2012 [Member] \| Non-employee [Member] \| Granted on January 7, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of vested shares, per share \| $ / shares									$ 11.05
Time Vested Restricted Stock Awards [Member] \| Vesting on May 1, 2013 [Member] \| Non-employee [Member] \| Granted on January 7, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of vested shares, per share \| $ / shares									16.25
Time Vested Restricted Stock Awards [Member] \| Vesting on May 1, 2014 [Member] \| Non-employee [Member] \| Granted on January 7, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of vested shares, per share \| $ / shares									$ 18.61
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value for options outstanding \| $	2,700,000								$ 2,700,000
Aggregate intrinsic value for options exercisable \| $	$ 2,700,000								2,700,000
Aggregate intrinsic value for options exercised \| $									$ 87,000	$ 224,000	$ 90,000
Number of unvested stock option	0								0
Unrecognized stock based compensation cost \| $	$ 0								$ 0
Stock Options [Member] \| Outside Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted									0	0	2,000
Vesting period
Expiration period											10 years
Weighted average exercise price, fair value \| $ / shares											$ 5.03
Fair value assumptions method used									Black-Scholes option-pricing model
Stock Options [Member] \| Selling, general and administrative expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $									$ 0	$ 10,000	$ 62,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted									0	0	0