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. 30, 2016	$ 49,331	$ 279,339	$ 252,472	$ (34,000)	$ 10,070	$ 557,212
Increase (Decrease) in Stockholders' Equity
Net income			85,922		1,062	86,984
Other comprehensive income				1,117	54	1,171
Stock issued for stock and employee benefit plans, net of cancellations and withholding tax	504	2,992	(1,747)			1,749
Purchases of 1,363 shares, 1,995 shares and 752 shares of common stock for the year ended April 29, 2017, April 28, 2018 and April 27, 2019, respectively	(1,363)	(3,300)	(31,294)			(35,957)
Stock option and restricted stock expense		8,864				8,864
Tax benefit from exercise of options		1,737				1,737
Dividends paid			(20,655)			(20,655)
Balance at Apr. 29, 2017	48,472	289,632	284,698	(32,883)	11,186	601,105
Increase (Decrease) in Stockholders' Equity
Net income			80,866		729	81,595
Other comprehensive income				7,684	1,120	8,804
Stock issued for stock and employee benefit plans, net of cancellations and withholding tax	311	4,046	(1,380)			2,977
Purchases of 1,363 shares, 1,995 shares and 752 shares of common stock for the year ended April 29, 2017, April 28, 2018 and April 27, 2019, respectively	(1,995)	(4,204)	(50,531)			(56,730)
Stock option and restricted stock expense		9,474				9,474
Dividends paid			(22,009)			(22,009)
Balance at Apr. 28, 2018	46,788	298,948	291,644	(25,199)	13,035	625,216
Increase (Decrease) in Stockholders' Equity
Net income			68,574		1,567	70,141
Other comprehensive income				23,374	(134)	23,240
Stock issued for stock and employee benefit plans, net of cancellations and withholding tax	919	15,200	(2,218)			13,901
Purchases of 1,363 shares, 1,995 shares and 752 shares of common stock for the year ended April 29, 2017, April 28, 2018 and April 27, 2019, respectively	(752)	(11,961)	(10,244)			(22,957)
Stock option and restricted stock expense		10,981				10,981
Cumulative effect adjustment for investments, net of tax | ASU 2016-01 - Investments			1,637	(1,637)
Cumulative effect adjustment for investments, net of tax				(1,637)
Dividends paid			(23,508)			(23,508)
Dividends declared not paid			(38)			(38)
Balance at Apr. 27, 2019	$ 46,955	$ 313,168	$ 325,847	$ (3,462)	$ 14,468	$ 696,976