CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Shares	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interests	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 and withholding tax	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
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			70,773		1,198	71,971
Other comprehensive income (loss)				(759)	(76)	(835)
Stock issued for stock and employee benefit plans, net of cancellations and withholding tax	898	26	(10,684)			(9,760)
Purchases of common stock	(2,132)	(1,267)	(48,454)			(51,853)
Stock option and restricted stock expense		6,780				6,780
Tax benefit from exercise of options		1,592				1,592
Dividends paid			(14,513)			(14,513)
Balance at Apr. 25, 2015	50,747	270,032	235,506	(32,139)	8,954	533,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			79,252		1,711	80,963
Other comprehensive income (loss)				(1,861)	(595)	(2,456)
Stock issued for stock and employee benefit plans, net of cancellations and withholding tax	243	97	(2,068)			(1,728)
Purchases of common stock	(1,659)	(346)	(42,077)			(44,082)
Stock option and restricted stock expense		8,292				8,292
Tax benefit from exercise of options		1,264				1,264
Dividends paid			(18,141)			(18,141)
Balance at Apr. 30, 2016	$ 49,331	$ 279,339	$ 252,472	$ (34,000)	$ 10,070	$ 557,212