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Income Taxes (Details) (USD $)	9 Months Ended
	Apr. 30, 2012	Jul. 31, 2011
Income Taxes [Abstract]
Income Tax effective tax rate, Continuing Operations	22.90%
Net discrete tax benefit relating to effective settlement of certain federal and state income tax audits	$ 3,845,000
Income Tax effective tax rate, Continuing Operations, excluding discrete adjustments	35.00%
Total unrecognized tax benefits, excluding interests - Ending and beginning balances	3,505,000	6,763,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	2,829,000	5,719,000
Income taxes payable non-current	3,297,000	3,811,000
Interest accrued relating to income taxes, net of the related income tax benefit	$ 141,000	$ 545,000

X

- Definition

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

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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- Definition

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 sum of the differences 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 all income tax settlements for the period.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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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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