Condensed 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			325
Stock-based compensation			117
Balance at Oct. 27, 2018			36,800	397,732	(155)		$ (12,900)	$ 417,034
Net income				89,908				89,908
Cash flow hedges, net of tax					(4,756)			(4,756)
Balance at Jul. 28, 2018	150	507	36,521	356,654	2,560	(5,100)
Stock options exercised			202
Stock-based compensation			77
Balance at Oct. 27, 2018			36,800	397,732	(155)		(12,900)	417,034
Net income				41,078				41,078
Cash flow hedges, net of tax					(2,715)			(2,715)
Balance at Apr. 27, 2019	150	507	37,065	313,430	(1,543)	(5,100)		331,609
Stock options exercised			147
Stock-based compensation			126
Balance at Oct. 26, 2019			37,338	380,626	(1,108)		(12,900)	399,513
Net income				67,196				67,196
Cash flow hedges, net of tax					435			435
Balance at Jul. 27, 2019	$ 150	$ 507	37,134	347,972	(1,527)	$ (5,100)
Stock options exercised			140
Stock-based compensation			64
Balance at Oct. 26, 2019			$ 37,338	380,626	(1,108)		$ (12,900)	399,513
Net income				$ 32,654				32,654
Cash flow hedges, net of tax					$ 419			$ 419