Severance (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Restructuring and Related Activities [Abstract]
Severance costs	$ 2.8	$ 1.0	$ 4.3	$ 23.3

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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