CONSOLIDATED STATEMENTS OF NET INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 23, 2015	Oct. 28, 2016	Oct. 23, 2015
Income Statement [Abstract]
Net Sales	$ 315,963	$ 325,021	$ 622,280	$ 646,734
Cost of sales	96,232	102,709	189,482	199,030
Operating wage and fringe benefit expenses	100,150	104,403	200,848	209,287
Other operating expenses	58,457	56,181	114,098	107,815
Selling, general and administrative expenses	25,487	29,902	50,945	70,361
Depreciation and amortization expense	17,646	20,107	35,219	40,260
Impairments	16,523	285	16,523	285
Operating Income	1,468	11,434	15,165	19,696
Net interest expense	1,741	2,883	3,633	5,489
(Loss) Income Before Income Taxes	(273)	8,551	11,532	14,207
(Benefit) Provision for income taxes	(491)	2,120	2,151	3,496
Net Income	$ 218	$ 6,431	$ 9,381	$ 10,711
Earnings Per Share — Net Income
Basic (in dollars per share)	$ 0.01	$ 0.29	$ 0.47	$ 0.48
Diluted (in dollars per share)	0.01	0.29	0.47	0.47
Cash Dividends Paid Per Share (in dollars per share)	$ 0.34	$ 0.31	$ 0.68	$ 0.62
Weighted Average Shares Outstanding
Basic (in shares)	19,825	22,115	19,807	22,421
Dilutive shares (in shares)	139	118	175	151
Diluted (in shares)	19,964	22,233	19,982	22,572