Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Nov. 30, 2012	Nov. 30, 2011
Income Tax Disclosure [Abstract]
Effective tax rate for the first quarter	38.50%	70.00%
State income taxes and dividends and accretion of discount		15.00%
Valuation allowance	$ 1,800,000
Tax credit carryforwards related to expiration period	Aug. 31, 2014
Net deferred tax assets	13,300,000
Accrued interest and penalties included in long-term tax liability	200,000
Liability increase relating to unrecognized tax benefits, interest	43,000
Liability increase relating to unrecognized tax benefits, penalties	$ 1,100,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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

This element represents the total of accruals as of the date of the statement of financial position for interest recognized 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 and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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- Definition

This element represents the recognized expense for the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties or, if not recognizing the expense in the period in which the tax return was initially filed, the expense is generally recognized in the period in which the enterprise's judgment about meeting the minimum statutory threshold changes.

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- Definition

This element represents interest expense recognized 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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