Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Oct. 31, 2012
Stockholders' Equity (Textual) [Abstract]
Remained available for repurchases	$ 1.1

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration