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Stock-Based Compensation - Other Share-Based Arrangements - Narrative (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
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May 01, 2011 Non-employee [Member] | Jul. 29, 2012 Stock Appreciation Rights (SARs) [Member] | Apr. 28, 2013 Stock Appreciation Rights (SARs) [Member] | Apr. 28, 2013 Stock Appreciation Rights (SARs) [Member] Selling, general and administrative expense [Member] | Apr. 29, 2012 Stock Appreciation Rights (SARs) [Member] Selling, general and administrative expense [Member] | Apr. 29, 2012 Stock Appreciation Rights (SARs) [Member] Accrued Expense [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items] |  |  |  |  |  |
Share-based compensation agreement, cash settlement amount | $ 644,000 |  |  |  |  |
Share-based compensation agreement, number of shares indexed | 68,260 |  |  |  |  |
Share-based compensation agreement, closing price of common stock | $ 9.44 |  |  |  |  |
Agreement date |  |  | May 02, 2011 |  |  |
Number of shares indexed |  |  | 70,000 |  |  |
Cash settlement |  |  | 35,000 |  |  |
Stock appreciation right value |  |  | 700,000 |  |  |
Closing price of common stock at the date of grant |  |  | $ 10.00 |  |  |
Ceiling price of common stock under stock appreciation right award |  |  | $ 12.00 |  |  |
Payment for fully vested award at fair value |  | 174,000 |  |  |  | 134,000
Compensation expense |  |  |  | $ 40,000 | $ 134,000 |

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- Definition The amount of cash payment made as settlement to a share-based compensation agreement. + References No definition available. + Details
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- Definition The closing price per share of the indexed shares for cash settlement under a share-based compensation agreement. + References No definition available. + Details
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- Definition The number of entity's shares indexed to determine the cash settlement value under a share-based compensation agreement. + References No definition available. + Details
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- Definition The amount of expense reported during the period resulting from stock appreciation rights awarded to a non-employee. + References No definition available. + Details
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- Definition The number of entity's shares indexed to a stock appreciation right for a specific period of time. + References No definition available. + Details
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- Definition The closing price per share of the indexed shares associated with a stock appreciation right award, above which market price appreciation will inure to the benefit of the rights holder. + References No definition available. + Details
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- Definition The aggregate base value of the indexed shares associated with a stock appreciation right award, determined by applying the closing price per indexed share on the award date, above which market price appreciation will inure to the benefit of the rights holder. + References No definition available. + Details
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- Definition The agreed upon price per indexed share used in determining the maximum amount of benefit that will inure to the holder of stock appreciation rights. + References No definition available. + Details
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- Definition The fair value amount the entity paid to a non-employee when the terms of an award of stock appreciation rights were fully satisfied. + References No definition available. + Details
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- Definition The amount the entity agreed to pay to the holder of stock appreciation rights, regardless of the market price of the entity's stock. + References No definition available. + Details
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- Definition The date on which stock appreciation rights were awarded to non-employees. + References No definition available. + Details
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