Income Taxes (Details) (USD $)	6 Months Ended
Jan. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]
Income tax effective rate, continuing operations	37.80%
Net discrete tax expense principally relating to the establishment of a valuation allowance on certain deferred tax assets	$ 365,000
Effective income tax rate, continuing operations, excluding discrete adjustments	35.50%
Unrecognized tax benefits	3,074,000	2,624,000
Interest accrued relating to income taxes	126,000	95,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	$ 2,351,000	$ 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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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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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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