Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified							3 Months Ended		12 Months Ended
	May 04, 2013	Feb. 02, 2013	Apr. 28, 2012	May 04, 2013 Nondesignated Stock [Member] Convertible Preferred Stock [Member]	Feb. 02, 2013 Nondesignated Stock [Member] Convertible Preferred Stock [Member]	Apr. 28, 2012 Nondesignated Stock [Member] Convertible Preferred Stock [Member]	May 04, 2013 Designated Stock [Member] Convertible Preferred Stock [Member]	Apr. 28, 2012 Designated Stock [Member] Convertible Preferred Stock [Member]	Feb. 02, 2013 Designated Stock [Member] Convertible Preferred Stock [Member]
Accumulated depreciation	$ 34,463	$ 31,530	$ 24,811
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01				$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000	100,000,000	5,000,000	5,000,000	10,000,000	0	90,000,000	0
Preferred Stock, shares Issued	0	0	89,291,773
Preferred Stock, shares outstanding	0	0	89,291,773
Preferred Stock, liquidation preference	$ 0	$ 0	$ 218,588
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	120,000,000	120,000,000	120,000,000
Common stock, shares issued	54,019,137	53,980,797	18,262,303
Common stock, shares outstanding	54,019,137	53,980,797	18,262,303
Preferred stock dividend, percentage							8.00%	8.00%	8.00%