CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Common Shares	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interest	Total
Balance at Apr. 27, 2013	$ 52,392	$ 241,888	$ 226,044	$ (35,496)	$ 7,140	$ 491,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			55,056		1,324	56,380
Other comprehensive income (loss)				4,116	(730)	3,386
Stock issued for stock and employee benefit plans, net of cancellations	937	2,395	(4,509)			(1,177)
Purchases of common stock	(1,348)	(3,056)	(27,693)			(32,097)
Stock option and restricted stock expense		8,739				8,739
Excess tax benefit from exercise of options		12,935				12,935
Dividends paid			(10,514)			(10,514)
Change in noncontrolling interests					98	98
Balance at Apr. 26, 2014	51,981	262,901	238,384	(31,380)	7,832	529,718
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			50,558		933	51,491
Other comprehensive income (loss)				323	(72)	251
Stock issued for stock and employee benefit plans, net of cancellations	815	(793)	(10,683)			(10,661)
Purchases of common stock	(1,530)	(448)	(33,774)			(35,752)
Stock option and restricted stock expense		6,094				6,094
Excess tax benefit from exercise of options		234				234
Dividends paid			(10,416)			(10,416)
Balance at Jan. 24, 2015	$ 51,266	$ 267,988	$ 234,069	$ (31,057)	$ 8,693	$ 530,959