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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Income Taxes [Abstract]
Income Tax Reconciliation, Tax Credits, Investment			$ 1.4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1.3	1.6
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 0.5	$ 0.5

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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