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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Oct. 31, 2012	Jul. 31, 2012
Income tax effective rate, continuing operations	35.50%
Effective income tax rate, continuing operations, excluding discrete adjustments	35.50%
Unrecognized tax benefits	$ 2,725,000	$ 2,624,000
Interest accrued relating to income taxes	109,000	95,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	$ 2,047,000	$ 1,990,000

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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