Concentration Risk Number Of Customers.

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Income tax examination possible losses.

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Income tax examination possible losses including interest and penalties.

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Open Purchase Commitments.

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- Definition

Percentage Of Accounts Receivable For Significant Customer.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

The average effective interest rate during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

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The estimated loss resulting from the income tax examination that has been accrued as of the balance sheet date, including interest and penalties.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Concentrations, Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Jul. 31, 2012	Feb. 09, 2012
Concentration Risk [Line Items]
Number of customers	4
Total accounts receivable	42.00%	52.00%
Total revenue	40.00%	46.00%
Commitment for inventory purchases	$ 1,934,000
Accounts receivable and inventories	1,000,000
Interest rate of loan	4.00%
Trade accounts receivable	800,000
Interest of base rate	2.00%
Personal property tax	320,000
Personal property tax including interest and penalties			530,000
Company's Liability			$ 80,000	$ 80,000
Customer One [Member]
Concentration Risk [Line Items]
Total accounts receivable	16.00%	15.00%
Total revenue	16.00%	16.00%
Customer Two [Member]
Concentration Risk [Line Items]
Total accounts receivable	9.00%	12.00%
Total revenue	13.00%	14.00%
Customer Three [Member]
Concentration Risk [Line Items]
Total accounts receivable	9.00%	9.00%
Total revenue	7.00%	11.00%
Customer Four [Member]
Concentration Risk [Line Items]
Total accounts receivable	8.00%	8.00%
Total revenue	4.00%	5.00%
Customer Five [Member]
Concentration Risk [Line Items]
Total accounts receivable		8.00%