Consolidated Statements of Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Accumulated Other Comprehensive Income (Loss) [Member]	Additional Paid-in Capital [Member]	Common Stock [Member]	Retained Earnings [Member]	Series C Preferred Stock [Member]	Series C Preferred Stock [Member] Preferred Stock [Member]	Series C Preferred Stock [Member] Treasury Stock [Member]	Series D Preferred Stock [Member]	Series D Preferred Stock [Member] Preferred Stock [Member]	Common Treasury Stock [Member]	Common Treasury Stock [Member] Treasury Stock [Member]
Beginning of period at Apr. 27, 2013					$ 37,828
Beginning of period at Apr. 27, 2013		(964)
Beginning of period at Apr. 27, 2013										400
Beginning of period at Apr. 27, 2013			50,398
Series D preferred redeemed
Stock-based compensation			56
Other			(35)
Net income	31,703				31,703
Preferred stock dividends and accretion					(449)
Cash flow hedges, net of tax	383	383
End of period at Jan. 25, 2014		(581)
End of period at Jan. 25, 2014								(5,100)				(12,900)
Total Shareholders' Equity at Jan. 25, 2014	101,974
End of period at Jan. 25, 2014				504			150			400
End of period at Jan. 25, 2014			50,419
End of period at Jan. 25, 2014					69,082
Beginning of period at May. 03, 2014	80,737				80,737
Beginning of period at May. 03, 2014	(205)	(205)
Beginning of period at May. 03, 2014						150			240	240
Beginning of period at May. 03, 2014	42,775		42,775
Series D preferred redeemed										(120)
Series D preferred redeemed			(5,791)
Stock-based compensation			212
Other			315
Net income	37,129				37,129
Preferred stock dividends and accretion					(238)
Cash flow hedges, net of tax	(235)	(235)
End of period at Jan. 31, 2015	(440)	(440)
End of period at Jan. 31, 2015						(5,100)		(5,100)			(12,900)	(12,900)
Total Shareholders' Equity at Jan. 31, 2015	137,473
End of period at Jan. 31, 2015				504		150	150		120	120
End of period at Jan. 31, 2015	37,511		37,511
End of period at Jan. 31, 2015	$ 117,628				$ 117,628