Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Provision (benefit) at statutory rate	35.00%	35.00%	35.00%
State income tax (benefit) — net	3.40%	(2.50%)	2.10%
Federal tax credits	(17.00%)	(6.00%)	(4.60%)
Worthless stock	(1.90%)	(30.10%)	0.00%
Officers life insurance	(2.60%)	(1.40%)	0.00%
Settlements with state taxing authorities	(4.00%)	0.00%	(2.10%)
Domestic Production Activity Deduction	(8.70%)	0.00%	(0.60%)
Other	(3.70%)	(3.00%)	(1.00%)
Provision (benefit) for income taxes	0.50%	(8.00%)	28.80%
Income Taxes Paid, Net [Abstract]
Income Taxes Paid	$ 16,332	$ 34,458	$ 33,686