Summary of Significant Accounting Policies Shares Excluded from Calculation as Effect of Conversion into Shares of Common Stock (Parenthetical) (Details)	3 Months Ended
	May. 31, 2015	May. 31, 2014
Series A preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Series A convertible preferred stock, dividend rate	6.25%	6.25%