Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member] Series C Preferred Stock [Member]	Common Stock Outstanding [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 (in shares) at Apr. 29, 2017	150,000	50,616,000				150,000	4,033,000
Balance at Apr. 29, 2017	$ 150	$ 506	$ 35,638	$ 227,928	$ (604)	$ (5,100)	$ (12,900)
Stock options exercised (in shares)		35,000
Stock options exercised		$ 1	559
Stock-based compensation			161
Net income				149,774				$ 149,774
Common stock cash dividend				(69,878)
Cash flow hedges					5,227			5,227
Other					(22)			(22)
Treasury Stock, Shares, Acquired (in shares)
Repurchase of common stock
Balance (in shares) at Apr. 28, 2018	150,000	50,651,000				150,000	4,033,000
Balance at Apr. 28, 2018	$ 150	$ 507	36,358	307,824	4,601	$ (5,100)	$ (12,900)	331,440
Stock options exercised (in shares)		27,000
Stock options exercised		$ 0	456
Stock-based compensation			251
Net income				140,853				140,853
Common stock cash dividend				(135,247)
Cash flow hedges					(6,318)			(6,318)
Other					174			174
Treasury Stock, Shares, Acquired (in shares)
Repurchase of common stock
Balance (in shares) at Apr. 27, 2019	150,000	50,678,000				150,000	4,033,000
Balance at Apr. 27, 2019	$ 150	$ 507	37,065	313,430	(1,543)	$ (5,100)	$ (12,900)	$ 331,609
Stock options exercised (in shares)		125,000						125,100
Stock options exercised		$ 1	740
Stock-based compensation			125
Net income				129,972				$ 129,972
Common stock cash dividend				0
Cash flow hedges					(3,673)			(3,673)
Other					(204)			$ (204)
Treasury Stock, Shares, Acquired (in shares)							154,000	154,512
Repurchase of common stock							$ (6,233)	$ (6,200)
Balance (in shares) at May. 02, 2020		50,803,000					4,187,000
Balance at May. 02, 2020		$ 508	$ 37,930	$ 443,402	$ (5,420)		$ (19,133)	$ 452,337