Subsequent Event (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended
	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Feb. 02, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Mar. 26, 2014 Subsequent Event [Member]	Mar. 26, 2014 Convertible Debt [Member] Subsequent Event [Member]	Mar. 26, 2014 Common Stock Class A Subsequent Event [Member]	Mar. 26, 2014 Common Stock Class A Convertible Debt [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Principal amount													$ 27,000,000
Number of shares called by warrants														8.8
Proceeds from sale of convertible notes and issuance of warrants												25,000,000
Interest rate													6.00%
Conversion price per share															$ 1.84
Exercise price of warrants														$ 2.12
Exercisable period of warrants												6 months 1 day
Floor exercise price of warrants														$ 1.76
Registration statement, filing term												45 days
Net income (loss)	(27,541,000)	(14,910,000)	958,000	3,110,000	(85,810,000)	(14,779,000)	(12,369,000)	(273,000)	(38,383,000)	(113,231,000)	15,082,000
Negative cash flow from operations									17,589,000	26,191,000	(61,900,000)
Cash and cash equivalents and short-term investments	$ 46,200,000								$ 46,200,000