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Description of Business and Basis of Presentation (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2013	Mar. 31, 2006
Description of Business and Basis of Presentation (Textual) [Abstract]
Overstated interest expense and accrued interest of long-term debt			$ 1.8
Impact of Overstatement of previously reported Interest Expenses on Statement of Operations		0.3
Decrease in Accumulated Deficit for Overstatement of previously reported Interest Expenses		1.5
Equity Ownership Percentage				56.50%
Cumulative Effect on Retained Earnings for Overstatement of previously reported Interest expenses	$ 1.8	$ 1.8

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Net of tax adjustment in the annual report for the year in which a restatement is made, of the resulting effects on the net income of prior periods on the beginning balance of retained earnings for the current period.

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- Definition

Resulting effect of restatement to correct an error, after tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period.

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