Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of fiscal year	$ 5,952us-gaap_UnrecognizedTaxBenefits	$ 9,554us-gaap_UnrecognizedTaxBenefits	$ 11,045us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year	63	31	366
Additions for tax positions of prior years	551	1,004	123
Reductions for tax positions of prior years	(284)	(25)	(271)
Reductions due to settlements with taxing authorities	(672)	(1,423)	(799)
Reductions due to statute of limitations expiration	(408)	(3,189)	(910)
Balance at end of fiscal year	$ 5,202us-gaap_UnrecognizedTaxBenefits	$ 5,952us-gaap_UnrecognizedTaxBenefits	$ 9,554us-gaap_UnrecognizedTaxBenefits

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

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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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