Consolidated Statements of Net Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 25, 2014	Jan. 24, 2014	Oct. 25, 2013	Jul. 26, 2013	Apr. 26, 2013	Jan. 25, 2013	Oct. 26, 2012	Jul. 27, 2012	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Income Statement [Abstract]
Net Sales	$ 326,371	$ 340,132	$ 332,600	$ 329,449	$ 333,909	$ 343,321	$ 329,555	$ 323,441	$ 1,328,552	$ 1,330,226	$ 1,287,210
Cost of sales									449,070	422,847	419,596
Operating wage and fringe benefit expenses									401,255	405,113	397,351
Other operating expenses									198,634	191,191	178,016
Selling, general and administrative expenses									154,632	153,802	125,508
Depreciation and amortization expense									79,456	69,319	60,264
Impairment of assets held for sale									12,380	0	0
Operating Income	4,277	7,954	8,895	11,999	22,239	19,119	21,976	24,620	33,125	87,954	106,475
Net interest expense									2,014	11,485	7,884
Income From Continuing Operations Before Income Taxes									31,111	76,469	98,591
Provision (Benefit) for income taxes									143	(6,084)	28,406
Income From Continuing Operations									30,968	82,553	70,185
Income (Loss) from Discontinued Operations, Net of Income Taxes	3,205	(354)	(134)	0	198	(80,219)	(3,239)	(114)	2,717	(83,374)	2,757
Net Income (Loss)	$ 13,009	$ 6,181	$ 6,119	$ 8,376	$ 29,781	$ (55,779)	$ 10,383	$ 14,794	$ 33,685	$ (821)	$ 72,942
Earnings Per Share - Income from Continuing Operations
Basic	$ 0.40	$ 0.25	$ 0.23	$ 0.30	$ 1.07	$ 0.87	$ 0.48	$ 0.53	$ 1.17	$ 2.94	$ 2.38
Diluted	$ 0.40	$ 0.24	$ 0.23	$ 0.30	$ 1.05	$ 0.86	$ 0.47	$ 0.52	$ 1.16	$ 2.90	$ 2.35
Earnings Per Share — Income (Loss) from Discontinued Operations
Basic	$ 0.13	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ (2.87)	$ (0.11)	$ 0.00	$ 0.10	$ (2.97)	$ 0.09
Diluted	$ 0.13	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ (2.82)	$ (0.11)	$ 0.00	$ 0.10	$ (2.93)	$ 0.09
Earnings per share - Net Income (Loss)
Basic	$ 0.53	$ 0.23	$ 0.22	$ 0.30	$ 1.07	$ (2.00)	$ 0.37	$ 0.53	$ 1.27	$ (0.03)	$ 2.48
Diluted	$ 0.53	$ 0.23	$ 0.22	$ 0.30	$ 1.06	$ (1.96)	$ 0.36	$ 0.52	$ 1.26	$ (0.03)	$ 2.44
Cash dividends paid	$ 0.31	$ 0.310	$ 0.31	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.25	$ 1.205	$ 1.075	$ 0.95
Weighted Average Shares Outstanding
Basic									26,450	28,066	29,464
Dilutive Shares									254	422	461
Diluted									26,704	28,488	29,925