Income Taxes (Details Textual) (USD $)	3 Months Ended	9 Months Ended
Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ (1,823,000)	$ 1,964,000	$ (2,366,000)	$ 6,428,000
Amount of research and development tax credits reinstated			1,000,000
Effective Income Tax Rate, Continuing Operations	40.60%		(259.40%)
Percentage of Statutory federal income tax rate	35.00%
Undistributed earnings from certain foreign subsidiaries	12,600,000		12,600,000
Unrecognized deferred tax liability	1,100,000		1,100,000
Unrecognized Tax Benefits, Period Increase (Decrease)			1,300,000
Unrecognized tax benefits	$ 2,900,000		$ 2,900,000

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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The amount of the deferred tax liability which was not recognized because of the exceptions to comprehensive recognition of deferred taxes.

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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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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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