CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at Beginning of Period at Apr. 29, 2017	$ 198,286	$ 52,530	$ 38,004	$ 113,967	$ (1,834)	$ (4,381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,562			5,562
Cumulative translation adjustments	1,808					1,808
Unrealized gain (loss) on available-for-sale securities, net of tax	(141)					(141)
Share-based compensation	2,635		2,635
Exercise of stock options	519	519	0
Tax payments related to RSU issuances	(311)		(311)
Employee savings plan activity	1,682	1,682
Dividends paid	(12,424)			(12,424)
Balance at End of Period at Apr. 28, 2018	197,616	54,731	40,328	107,105	(1,834)	(2,714)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(958)			(958)
Cumulative translation adjustments	(1,749)					(1,749)
Unrealized gain (loss) on available-for-sale securities, net of tax	107					107
Share-based compensation	2,479		2,479
Exercise of stock options	1,318	1,318	0
Tax payments related to RSU issuances	(246)		(246)
Employee savings plan activity	1,650	1,650
Dividends paid	(12,554)			(12,554)
Balance at End of Period at Apr. 27, 2019	187,663	57,699	42,561	93,593	(1,834)	(4,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	491			491
Cumulative translation adjustments	(965)					(965)
Unrealized gain (loss) on available-for-sale securities, net of tax	44					44
Share-based compensation	2,265		2,265
Exercise of stock options	0	0	0
Tax payments related to RSU issuances	(199)		(199)
Employee savings plan activity	2,311	2,311
Dividends paid	(8,994)			(8,994)
Treasury stock purchase	(5,636)				(5,636)
Balance at End of Period at May. 02, 2020	$ 176,980	$ 60,010	$ 44,627	$ 85,090	$ (7,470)	$ (5,277)