Income Taxes Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal tax rate	35.00%	35.00%	35.00%
State and local income tax — net	0.90%	3.90%	6.80%
Domestic production activity deduction	(13.50%)	(11.70%)	13.40%
Fixed assets	0.00%	0.00%	2.20%
Officers life insurance	(2.50%)	2.70%	4.40%
Other	(1.40%)	(1.50%)	(0.20%)
Provision for income taxes	18.50%	28.40%	61.60%