CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY CONDENSED 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. 27, 2019	$ 187,663	$ 57,699	$ 42,561	$ 93,593	$ (1,834)	$ (4,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,030			7,030
Cumulative translation adjustments	(526)					(526)
Unrealized gain (loss) on available-for-sale securities, net of tax	41					41
Share-based compensation	643		643
Employee savings plan activity	779	779
Dividends paid	(2,250)			(2,250)
Treasury stock purchase	1,187				1,187
Balance at End of Period at Aug. 03, 2019	192,193	58,478	43,204	98,373	(3,021)	(4,841)
Balance at Beginning 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	14,304
Cumulative translation adjustments	(380)
Unrealized gain (loss) on available-for-sale securities, net of tax	44
Balance at End of Period at Nov. 02, 2019	198,011	59,276	43,546	103,397	(3,516)	(4,692)
Balance at Beginning of Period at Aug. 03, 2019	192,193	58,478	43,204	98,373	(3,021)	(4,841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,274			7,274
Cumulative translation adjustments	146					146
Unrealized gain (loss) on available-for-sale securities, net of tax	3					3
Share-based compensation	541		541
Tax payments related to RSU issuances	(199)		(199)
Employee savings plan activity	798	798
Dividends paid	(2,250)			(2,250)
Treasury stock purchase	495				495
Balance at End of Period at Nov. 02, 2019	198,011	59,276	43,546	103,397	(3,516)	(4,692)
Balance at Beginning of Period at May. 02, 2020	176,980	60,010	44,627	85,090	(7,470)	(5,277)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,467			7,467
Cumulative translation adjustments	1,037					1,037
Share-based compensation	539		539
Treasury stock reissued	199		26		173
Balance at End of Period at Aug. 01, 2020	186,222	60,010	45,192	92,557	(7,297)	(4,240)
Balance at Beginning of Period at May. 02, 2020	176,980	60,010	44,627	85,090	(7,470)	(5,277)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,883
Cumulative translation adjustments	1,421
Unrealized gain (loss) on available-for-sale securities, net of tax	0
Balance at End of Period at Oct. 31, 2020	190,405	60,010	45,575	95,973	(7,297)	(3,856)
Balance at Beginning of Period at Aug. 01, 2020	186,222	60,010	45,192	92,557	(7,297)	(4,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,416			3,416
Cumulative translation adjustments	384					384
Unrealized gain (loss) on available-for-sale securities, net of tax	0
Share-based compensation	508		508
Tax payments related to RSU issuances	(125)		(125)
Balance at End of Period at Oct. 31, 2020	$ 190,405	$ 60,010	$ 45,575	$ 95,973	$ (7,297)	$ (3,856)