Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	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, Preferred [Member] Series C Preferred Stock [Member]	Treasury Stock, Common [Member]
Balance at Jul. 29, 2017	$ 213,471	$ 150	$ 506	$ 35,725		$ (1,232)	$ (5,100)	$ (12,900)
Balance at Apr. 29, 2017				35,638	$ 227,928	(604)
Stock options exercised				46
Stock-based compensation				41
Net income	38,272				38,272
Common stock cash dividend					(69,878)
End of period					196,322
Cash flow hedges, net of tax	(628)					(628)
Balance at Jul. 28, 2018	378,392	$ 150	$ 507	36,521		2,560	$ (5,100)	$ (12,900)
Balance at Apr. 28, 2018	331,440			36,358	307,824	4,601
Stock options exercised				123
Stock-based compensation				$ 40
Net income	48,830				48,830
Common stock cash dividend
End of period					$ 356,654
Cash flow hedges, net of tax	$ (2,041)					$ (2,041)