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 after one year (or the normal operating cycle, if longer).

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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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 total of 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 and 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.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, income tax penalties and interest expense	$ 0.2	$ 0.1	$ 0.3
Unrecognized tax benefits, income tax penalties and interest accrued	0.2	0.1
Current assets
Operating Loss Carryforwards [Line Items]
Net deferred tax assets	37.6	59.9
Other liabilities, noncurrent
Operating Loss Carryforwards [Line Items]
Deferred Tax Liabilities, Net, Noncurrent	309.7	293.1
Foreign tax credit
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	7.0
General business tax credit carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	55.4
NCRA
Operating Loss Carryforwards [Line Items]
Change in valuation allowance for deferred tax asset	$ 12.4