Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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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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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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Stock Award Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended	0 Months Ended	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	Oct. 11, 2011 Class A [Member]	Jul. 31, 2013 Class A [Member]
Class of Stock [Line Items]
Shares awarded (in shares)				62,099	16,387
Shares awarded, value				$ 0.9	$ 0.2
Share-based award, vesting period	3 years
Compensation expense	0.2	0.3
Unrecognized compensation expense	0.3
Excess tax benefits accumulated in Capital in Excess of Par Value	$ 0.2		$ 0.2