CONSOLIDATED STATEMENTS OF NET INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013
Income Statement [Abstract]
Net Sales	$ 333,279	$ 332,600	$ 659,619	$ 662,049
Cost of sales	116,012	113,605	229,475	220,246
Operating wage and fringe benefit expenses	102,785	101,971	207,214	204,817
Other operating expenses	49,973	49,460	99,481	98,382
Selling, general and administrative expenses	36,022	36,617	74,667	69,819
Depreciation and amortization expense	19,475	18,281	39,448	35,511
Impairment of assets held for sale	0	3,771	258	12,380
Operating Income	9,012	8,895	9,076	20,894
Net interest expense (income)	2,203	140	3,819	(16)
Income Before Income Taxes	6,809	8,755	5,257	20,910
Provision for income taxes	770	2,502	234	6,281
Income From Continuing Operations	6,039	6,253	5,023	14,629
Loss from discontinued operations, net of income taxes	0	(134)	0	(134)
Net Income	$ 6,039	$ 6,119	$ 5,023	$ 14,495
Earnings Per Share— Income from Continuing Operations
Basic	$ 0.26	$ 0.23	$ 0.21	$ 0.54
Diluted	$ 0.25	$ 0.23	$ 0.21	$ 0.53
Loss Per Share—Loss from Discontinued Operations
Basic	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings Per Share—Net Income
Basic	$ 0.26	$ 0.23	$ 0.21	$ 0.53
Diluted	$ 0.25	$ 0.23	$ 0.21	$ 0.53
Cash Dividends Paid Per Share	$ 0.31	$ 0.310	$ 0.62	$ 0.585
Weighted Average Shares Outstanding
Basic	23,509	27,086	23,467	27,287
Dilutive shares	226	98	231	115
Diluted	23,735	27,184	23,698	27,402