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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. 30, 2016	$ 201,067	$ 51,347	$ 35,351	$ 117,276	$ (9)	$ (2,898)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	10,342			10,342
Cumulative translation adjustments	(1,472)					(1,472)
Unrealized gain (loss) on available-for-sale securities, net of tax	(11)					(11)
Share-based compensation	2,914		2,914
Exercise of stock options	343	343	0
Tax payments related to RSU issuances	(261)		(261)
Employee savings plan activity	840	840
Dividends paid	(13,651)			(13,651)
Treasury stock purchase	(1,825)				(1,825)
Balance at End 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 (loss) income	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 (loss) income	(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)

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