Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory Federal Tax Rate	35.00%	35.00%	35.00%
State income tax (benefit) — net	0.50%	1.50%	(2.50%)
Federal tax credits	(72.40%)	(17.00%)	(6.00%)
Domestic Production Activity Deduction	(29.20%)	(8.70%)	0.00%
Worthless stock	0.00%	(1.90%)	(30.10%)
Officers life insurance	(6.90%)	(2.60%)	(1.40%)
Charitable Contributions	(4.50%)	(1.00%)	(0.40%)
Settlements with state taxing authorities	0.00%	(4.00%)	0.00%
State and Local Tax Reserves	(5.80%)	(0.30%)	(1.30%)
Other	0.10%	(0.50%)	(1.30%)
Provision (benefit) for income taxes	(83.20%)	0.50%	(8.00%)
Income Taxes Paid, Net [Abstract]
Income Taxes Paid	$ 10,543us-gaap_IncomeTaxesPaid	$ 16,332us-gaap_IncomeTaxesPaid	$ 34,458us-gaap_IncomeTaxesPaid

Effective Income Tax Rate Reconciliation, Deduction, Worthless Stock, Percent

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Effective Income Tax Rate Reconciliation, State and Local Tax Reserves, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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