Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended
	Jul. 28, 2012	Jul. 28, 2012	Jul. 28, 2012 Fair Value, Measurements, Recurring [Member] Derivative Financial Instruments, Liabilities [Member] Series B Preferred Stock [Member]	Apr. 28, 2012 Fair Value, Measurements, Recurring [Member] Derivative Financial Instruments, Liabilities [Member] Series B Preferred Stock [Member]
Summary of derivative liability activity
Beginning balance as of January 28, 2012			$ 13,743	$ 20,076
Loss on change in fair value	(8,219)	(1,886)	8,219	(6,333)
Ending balance as of July 28, 2012			$ 21,962	$ 13,743