Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock
Stockholders Equity at Apr. 29, 2011	$ 679,570	$ 426	$ 188,583	$ 834,174	$ (343,613)
Shares Outstanding Beginning Balance at Apr. 29, 2011		30,229
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	72,942			72,942
Dividends paid	(28,262)			(28,262)
Treasury stock repurchased	(70,269)				(70,269)
Treasury stock repurchased, shares		(2,111)
Treasury stock reissued under stock plans	17,366		12,838		4,528
Treasury stock reissued under stock plans, shares		493
Tax benefit — stock plans	788		788
Stockholders Equity at Apr. 27, 2012	672,135	426	202,209	878,854	(409,354)
Shares Outstanding Ending Balance at Apr. 27, 2012		28,611
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(821)			(821)
Dividends paid	(30,214)			(30,214)
Treasury stock repurchased	(63,052)				(63,052)
Treasury stock repurchased, shares		(1,560)
Treasury stock reissued under stock plans	14,633		10,838		3,795
Treasury stock reissued under stock plans, shares		367
Tax benefit — stock plans	2,094		2,094
Stockholders Equity at Apr. 26, 2013	594,775	426	215,141	847,819	(468,611)
Shares Outstanding Ending Balance at Apr. 26, 2013		27,418
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,685
Dividends paid	(31,885)			(31,885)
Treasury stock repurchased	(224,994)				(224,994)
Treasury stock repurchased, shares		(4,393)
Treasury stock reissued under stock plans	12,251		8,665		3,586
Treasury stock reissued under stock plans, shares		438
Tax benefit — stock plans	1,756		1,756
Stockholders Equity at Apr. 25, 2014	$ 385,588	$ 426	$ 225,562	$ 849,619	$ (690,019)
Shares Outstanding Ending Balance at Apr. 25, 2014		23,463