Debt (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended									1 Months Ended					1 Months Ended
	May 31, 2011	Feb. 28, 2012 Standby Letters of Credit [Member]	Mar. 31, 2010 Standby Letters of Credit [Member]	Nov. 30, 2008 Standby Letters of Credit [Member]	Jul. 31, 2007 Revolving Line of Credit [Member]	Jul. 18, 2007 Revolving Credit Facility [Member]	Nov. 30, 2008 Revolving Credit Facility [Member] Amendment One [Member]	Sep. 27, 2010 Revolving Credit Facility [Member] Amendment Four [Member]	Jan. 31, 2012 Revolving Credit Facility [Member] Amendment Five [Member]	Jul. 31, 2007 Equipment loan facility [Member]	Nov. 30, 2008 Credit Card Services Subfacility [Member] Amendment One [Member]	Jul. 20, 2009 Letter of Credit [Member] Amendment Two [Member]	Jan. 22, 2010 Letter of Credit [Member] Amendment Three [Member]	Sep. 27, 2010 Combined Letter Of Credit And Credit Card Services Subfacility [Member]	May 31, 2011 Credit Card Receivable [Member] Standby Letters of Credit [Member]
Debt (Textual) [Abstract]
Loan and security agreement, issue date					Jul. 18, 2007
Revolving line of credit with a borrowing capacity						$ 2.00	$ 7.00	$ 10.00	$ 30.00		$ 0.20	$ 0.90	$ 1.00	$ 2.65
Equipment loan facility										0.3
Loan agreement, terminated date										Jan. 18, 2011
Option to increase the borrowing capacity of the revolving line of credit								15.0
Standby letter of credit in favor of its landlord	$ 0.8	$ 0.5	$ 0.3	$ 0.1											$ 0.5
Line of credit facility current borrowing capacity percentage									100.00%