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Income Taxes - Additional Information (Detail) (USD $)	6 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Jan. 31, 2013	Jul. 31, 2012
Income Taxes [Line Items]
Unrecognized tax benefits related to federal, state and foreign taxes	$ 1,300,000	$ 1,300,000
Liabilities for interest expense related to uncertain tax positions	62,000	78,000
Unrecognized tax benefits to be reversed in next twelve months due to expiration of statute of limitations	$ 200,000
Stockholder owning ownership on corporation's securities percentage	5.00%
Stockholder owning ownership on corporation's securities rolling period	3 years
Tax Benefit Preservation Plan, adoption date	2011-10-17
Any person acquiring shares of the Company's securities holding percentage as amended by Tax Plan which protects Tax Benefits	4.99%
United States Of America \| Domestic Tax Authority
Income Taxes [Line Items]
Tax examinations tax period	Tax years ended July 31, 2009 through July 31, 2012
Europe \| Foreign Tax Authority
Income Taxes [Line Items]
Tax examinations tax period	2006 through 2012 tax years
Asia \| Foreign Tax Authority
Income Taxes [Line Items]
Tax examinations tax period	2002 through 2012 tax years

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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