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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- 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 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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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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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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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 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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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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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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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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Stock-Based Compensation - Narrative (Detail) (USD $)	12 Months Ended					12 Months Ended				12 Months Ended					12 Months Ended					12 Months Ended
Stock-Based Compensation - Narrative (Detail) (USD $)	Apr. 28, 2013	Apr. 27, 2014	Apr. 27, 2014 2007 Equity Incentive Plan [Member]	Sep. 20, 2007 2007 Equity Incentive Plan [Member]	Sep. 20, 2007 2002 Stock Option Plan [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member]	Apr. 28, 2013 Time Vested Restricted Stock Awards [Member]	Apr. 29, 2012 Time Vested Restricted Stock Awards [Member]	May 01, 2011 Time Vested Restricted Stock Awards [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Selling, general and administrative expense [Member]	Apr. 28, 2013 Time Vested Restricted Stock Awards [Member] Selling, general and administrative expense [Member]	Apr. 29, 2012 Time Vested Restricted Stock Awards [Member] Selling, general and administrative expense [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Granted on July 1, 2009 [Member]	Apr. 28, 2013 Time Vested Restricted Stock Awards [Member] Granted on July 1, 2009 [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Granted on July 1, 2009 [Member] Executive Officer [Member]	May 02, 2010 Time Vested Restricted Stock Awards [Member] Granted on July 1, 2009 [Member] Executive Officer [Member] ExecutiveOfficers	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member]	May 03, 2009 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member]	Apr. 28, 2013 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member]	May 03, 2009 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member] Key management employees [Member]	May 03, 2009 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member] Non-employee [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member] Non-employee [Member] Vesting on May 1, 2012 [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member] Non-employee [Member] Vesting on May 1, 2013 [Member]	Apr. 27, 2014 Time Vested Restricted Stock Awards [Member] Granted on January 7, 2009 [Member] Non-employee [Member] Vesting on May 1, 2014 [Member]	Apr. 27, 2014 Stock Options [Member]	Apr. 28, 2013 Stock Options [Member]	Apr. 29, 2012 Stock Options [Member]	Apr. 27, 2014 Stock Options [Member] Selling, general and administrative expense [Member]	Apr. 28, 2013 Stock Options [Member] Selling, general and administrative expense [Member]	Apr. 29, 2012 Stock Options [Member] Selling, general and administrative expense [Member]	Apr. 27, 2014 Stock Options [Member] Outside Director [Member]	Apr. 28, 2013 Stock Options [Member] Outside Director [Member]	Apr. 29, 2012 Stock Options [Member] Outside Director [Member]	Apr. 27, 2014 Performance Based Restricted Stock Units [Member]	Apr. 29, 2012 Performance Based Restricted Stock Units [Member]	May 01, 2011 Performance Based Restricted Stock Units [Member]	May 02, 2010 Performance Based Restricted Stock Units [Member]	Apr. 27, 2014 Performance Based Restricted Stock Units [Member] Selling, general and administrative expense [Member]	Apr. 28, 2013 Performance Based Restricted Stock Units [Member] Selling, general and administrative expense [Member]	Apr. 29, 2012 Performance Based Restricted Stock Units [Member] Selling, general and administrative expense [Member]	Apr. 27, 2014 Performance Based Restricted Stock Units [Member] Granted on June 25, 2013 [Member]	Apr. 27, 2014 Performance Based Restricted Stock Units [Member] Granted on June 25, 2013 [Member] Maximum [Member]	Apr. 27, 2014 Performance Based Restricted Stock Units [Member] Granted on July 11, 2012 [Member]	Apr. 27, 2014 Performance Based Restricted Stock Units [Member] Granted on July 11, 2012 [Member] Maximum [Member]	Apr. 27, 2014 Stock Compensation Plan [Member] Selling, general and administrative expense [Member]	Apr. 28, 2013 Stock Compensation Plan [Member] Selling, general and administrative expense [Member]	Apr. 29, 2012 Stock Compensation Plan [Member] Selling, general and administrative expense [Member]	Apr. 27, 2014 Stock Compensation Plan [Member] Granted on October 1, 2013 [Member] Outside Director [Member]	Apr. 28, 2013 Stock Compensation Plan [Member] Granted on October 8, 2012 [Member] Outside Director [Member]	Apr. 29, 2012 Stock Compensation Plan [Member] Granted on October 1, 2011 [Member] Board of directors [Member]	Apr. 27, 2014 Employee Stock Option [Member]	Apr. 28, 2013 Employee Stock Option [Member]	Apr. 29, 2012 Employee Stock Option [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			632,963		0
Number of options granted	2,000																														0	2,000	0																		0	0	0
Vesting period																																0 days									3 years		3 years					0 days	0 days	0 days
Expiration period																																10 years
Weighted average exercise price, fair value																																$ 5.03
Fair value assumptions method used																															Black-Scholes option-pricing model
Share-based compensation expense										$ 62,000	$ 140,000	$ 189,000																$ 10,000	$ 62,000	$ 134,000								$ 581,000	$ 340,000	$ 0					$ 57,000	$ 20,000	$ 26,000
Aggregate intrinsic value for options exercisable																									1,800,000
Weighted average contractual term for options exercisable																									3 years 7 months 6 days
Aggregate intrinsic value for options outstanding																									1,800,000
Aggregate intrinsic value for options exercised																									224,000	90,000	220,000
Unrecognized stock based compensation cost		0
Number of executive officers granted time vested restricted common stock																2
Number of shares granted																80,000		115,000		105,000	10,000														0	0	0					72,380		120,000				3,000	1,658	3,075
Vesting description															Vests in equal one-third installments on July 1, 2012, 2013, and 2014		Vests in equal one-third installments on May 1, 2012, 2013, and 2014
Closing price of common stock																$ 5.08				$ 1.88																					$ 17.12		$ 10.21					$ 18.84	$ 12.13	$ 8.45
Weighted average fair value of vested shares, per share						$ 4.04	$ 3.76	$ 1.88														$ 11.05	$ 16.25	$ 18.61
Number of shares vested						61,667	61,665	10,000																											0
Weighted average fair value of vested shares						249,000	232,000	18,800
Number of shares outstanding and unvested						61,668	123,335	185,000	195,000				26,668	53,335			35,000		70,000
Weighted average fair value of outstanding and unvested shares, per share						$ 4.17	$ 4.04
Remaining unrecognized compensation cost						$ 5,000																												$ 924,000
Weighted average period over which unrecognized compensation cost is expected to be recognized						2 months 12 days																												1 year 8 months 12 days