CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]	Unearned ESOP Shares [Member]
Balance at Apr. 30, 2011	$ 1,560,540	$ 1,211		$ 41,950	$ 1,632,497	$ (115,118)
Balance, Shares at Apr. 30, 2011		121,099,850
Foreign currency translation	(9,372)			(9,372)
Cash flow hedge	(123)			(123)
Net income	212,815				212,815
Dividends declared	(55,319)				(55,319)
Common stock issued and related tax benefits (in shares)		778,856
Common stock issued and related tax benefits	14,560	8	14,552
Repurchase of common stock (in shares)		(11,954,257)
Repurchase of common stock	(361,047)	(120)	(27,167)		(333,760)
Stock-based compensation	12,615		12,615
ESOP activity	533					533
Balance at Apr. 28, 2012	1,375,202	1,099		32,455	1,456,233	(114,585)
Balance, Share at Apr. 28, 2012		109,924,449
Foreign currency translation	(7,132)			(7,132)
Cash flow hedge	(158)			(158)
Net income	210,272				210,272
Dividends declared	(57,384)				(57,384)
Common stock issued and related tax benefits (in shares)		869,580
Common stock issued and related tax benefits	21,325	9	21,316
Repurchase of common stock (in shares)		(5,224,017)
Repurchase of common stock	(181,756)	(52)	(35,941)		(145,763)
Stock-based compensation	14,625		14,625
ESOP activity	19,461					19,461
Balance at Apr. 27, 2013	1,394,455	1,056		25,165	1,463,358	(95,124)
Balance, Share at Apr. 27, 2013	105,570,000	105,570,012
Foreign currency translation	6,059			6,059
Cash flow hedge	(5,854)			(5,854)
Net income	200,612				200,612
Dividends declared	(72,413)				(72,413)
Common stock issued and related tax benefits (in shares)		748,874
Common stock issued and related tax benefits	27,468	7	27,461
Repurchase of common stock (in shares)		(2,354,000)
Repurchase of common stock	(96,486)	(23)	(36,104)		(60,359)
Stock-based compensation	8,643		8,643
ESOP activity	9,180					9,180
Balance at Apr. 26, 2014	$ 1,471,664	$ 1,040		$ 25,370	$ 1,531,198	$ (85,944)
Balance, Share at Apr. 26, 2014	103,965,000	103,964,886