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Benefit Plans (Detail) (USD $)	12 Months Ended
	Apr. 27, 2014	Apr. 28, 2013	Apr. 29, 2012
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to defined contribution plans	$ 696,000	$ 635,000	$ 606,000
Contributions to nonqualified deferred compensation plan	166,000	145,000	132,000
Investment assets of Trust at fair value	765,000
Deferred Compensation [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Nonqualified deferred compensation plan liability	2,600,000
Accrued Expense [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Nonqualified deferred compensation plan liability		$ 2,000,000

X

- 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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X

- Details

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X

- 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

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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