Summary of Changes in Gross Amounts of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 28, 2012	Apr. 30, 2011
Income Taxes [Line Items]
Balances beginning of period	$ 18,963	$ 18,685
Additions for tax positions related to the current year	2,288	2,737
Additions for tax positions of prior years	474	468
Reductions for tax positions of prior years	(1,778)	(1,309)
Statute expirations	(1,618)	(1,504)
Settlements	(230)	(114)
Balance, end of period	$ 18,099	$ 18,963

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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