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Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Aug. 31, 2011
Restructuring [Abstract]
Restructuring charges	$ 0.5	$ 0.5
Restructuring reserve	$ 3.9		$ 3.6

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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