Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member] Series C Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member] Series C Preferred Stock [Member]	Treasury Stock, Common [Member]	Total
Balance at Apr. 28, 2018	$ 150	$ 507	$ 36,358	$ 307,824	$ 4,601	$ (5,100)
Stock options exercised			123
Stock-based compensation			40
Balance at Jul. 28, 2018			36,521	356,654	2,560		$ (12,900)	$ 378,392
Net income				48,830				48,830
Cash flow hedges					(2,041)			(2,041)
Balance at Apr. 27, 2019	$ 150	$ 507	37,065	313,430	(1,543)	$ (5,100)		331,609
Stock options exercised			7
Stock-based compensation			62
Balance at Jul. 27, 2019			$ 37,134	347,972	(1,527)		$ (12,900)	366,236
Net income				$ 34,542				34,542
Cash flow hedges					$ 16			$ 16