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Stock Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Stock-Based Compensation (Textual) [Abstract]
Stock-based compensation expense	$ 0.2	$ 0.3	$ 0.4	$ 0.6
Shares available to grant as stock-based compensation awards	329,479		329,479

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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