Income Taxes, Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
Apr. 25, 2015	Apr. 26, 2014	Apr. 27, 2013
Reconciliation of the beginning and ending balance of unrecognized tax benefits
Balance at the beginning of the period	$ 2,972,000us-gaap_UnrecognizedTaxBenefits	$ 3,248,000us-gaap_UnrecognizedTaxBenefits	$ 3,909,000us-gaap_UnrecognizedTaxBenefits
Additions:
Positions taken during the current year	94,000	88,000	338,000
Reductions:
Positions taken during the prior year	(702,000)	(99,000)	(28,000)
Decreases related to settlements with taxing authorities	(25,000)	(98,000)
Reductions resulting from the lapse of the statue of limitations	(113,000)	(167,000)	(971,000)
Balance at the end of the period	2,226,000us-gaap_UnrecognizedTaxBenefits	2,972,000us-gaap_UnrecognizedTaxBenefits	3,248,000us-gaap_UnrecognizedTaxBenefits
Interest and penalties accrued	300,000	300,000
Recognition of unrecognized tax benefit that would decrease the effective tax rate	400,000
Cash paid for taxes	$ 34,400,000us-gaap_IncomeTaxesPaidNet	$ 25,000,000us-gaap_IncomeTaxesPaidNet	$ 20,500,000us-gaap_IncomeTaxesPaidNet

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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