Consolidated Statements of Changes in Convertible Preferred Stock and Shareholders' Equity (Deficit) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Feb. 02, 2013
Statement of Stockholders' Equity [Abstract]
Issuance of common stock, issuance costs	$ 8,533
Preferred stock dividend, percentage	8.00%

The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration