Summary of Significant Accounting Policies Shares Excluded from Calculation as Effect of Conversion into Shares of Common Stock (Details)	6 Months Ended
Aug. 31, 2015	Aug. 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%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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