Quarterly report pursuant to Section 13 or 15(d)

Investments (Details Textual 1)

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Investments (Details Textual 1) (Accolade [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Accolade [Member]
       
Schedule of Investments [Line Items]        
Investment ownership description less than 20%   less than 20%  
Investment income, Dividend $ 0 $ 0 $ 0 $ 0
Interest income on AFS debt securities $ 1.2 $ 1.6 $ 2.4 $ 3.1
Contractual maturity of AFS debt securities Jan. 31, 2023   Jan. 31, 2023