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Benefit Plans (Detail) (USD $) | 12 Months Ended
--- | ---
Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Contributions to defined contribution plans | $ 635,000 | $ 606,000 | $ 543,000
Contributions to nonqualified deferred compensation plan | 145,000 | 132,000 | 120,000
Accrued Expense [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Nonqualified deferred compensation plan liability | $ 2,000,000 | $ 1,700,000 |

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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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- Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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