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Income Taxes (Narrative) (Details) (USD $)	Jul. 31, 2013	Jul. 31, 2012	Aug. 01, 2005
Income Tax Disclosure [Abstract]
Foreign research and experimentation credits	$ 484,000
Minimum taxable income in the future to fully utilize gross deferred tax assets	62,100,000
Hypothetical tax benefits related to stock-based awards	19,981,000	22,786,000	8,593,000
Total unrecognized tax benefit recorded as non-current income taxes payable	2,963,000	2,624,000
Interest accrued relating to income taxes	90,000	95,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	$ 2,348,000	$ 1,990,000

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

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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