Current and Noncurrent Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Aug. 31, 2011
Income Taxes [Line Items]
Current deferred tax assets	$ 27,833	$ 15,737
Current deferred tax liabilities	(3,955)	(5,182)
Noncurrent deferred tax assets	73,411	74,989
Noncurrent deferred tax liabilities	(24,245)	(15,761)
Net deferred tax assets	$ 73,044	$ 69,783

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

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