CONSOLIDATED STATEMENTS OF NET INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014
Income Statement [Abstract]
Net Sales	$ 357,177	$ 340,132	$ 1,016,796	$ 1,002,181
Cost of sales	124,544	118,381	354,019	338,626
Operating wage and fringe benefit expenses	109,116	103,904	319,158	308,721
Other operating expenses	49,096	48,451	148,165	146,833
Selling, general and administrative expenses	46,345	39,350	118,596	109,170
Depreciation and amortization expense	20,403	22,092	59,851	57,603
Impairment of assets held for sale	0	0	258	12,380
Operating Income	7,673	7,954	16,749	28,848
Net interest expense	2,406	875	6,225	859
Income Before Income Taxes	5,267	7,079	10,524	27,989
Provision (Benefit) for income taxes	(653)	544	(419)	6,825
Income From Continuing Operations	5,920	6,535	10,943	21,164
Loss from discontinued operations, net of income taxes	0	(354)	0	(488)
Net Income	$ 5,920	$ 6,181	$ 10,943	$ 20,676
Earnings Per Share— Income from Continuing Operations
Basic (in dollars per share)	$ 0.25	$ 0.25	$ 0.47	$ 0.78
Diluted (in dollars per share)	$ 0.25	$ 0.25	$ 0.46	$ 0.78
Loss Per Share—Loss from Discontinued Operations
Basic (in dollars per share)	$ 0.00	$ (0.01)	$ 0.00	$ (0.02)
Diluted (in dollars per share)	$ 0.00	$ (0.01)	$ 0.00	$ (0.02)
Earnings Per Share—Net Income
Basic (in dollars per share)	$ 0.25	$ 0.24	$ 0.47	$ 0.76
Diluted (in dollars per share)	$ 0.25	$ 0.24	$ 0.46	$ 0.76
Cash Dividends Paid Per Share (in dollars per share)	$ 0.31	$ 0.310	$ 0.930	$ 0.895
Weighted Average Shares Outstanding
Basic	23,515	26,336	23,487	26,970
Dilutive shares	231	41	230	93
Diluted	23,746	26,377	23,717	27,063