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Debt (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Nov. 30, 2008
Nov. 30, 2008
Standby Letters of Credit [Member]
Jul. 31, 2007
Revolving Line of Credit [Member]
Jan. 31, 2012
Revolving Credit Facility [Member]
Amendment Five [Member]
Sep. 27, 2010
Combined Letter Of Credit And Credit Card Services Subfacility [Member]
Debt (Textual) [Abstract]          
Loan and security agreement, issue date     Jul. 18, 2007    
Revolving line of credit with a borrowing capacity       $ 30.00 $ 2.65
Standby letter of credit in favor of its landlord $ 0.5 $ 0.1      
Line of credit facility current borrowing capacity percentage       100.00%