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Property, Plant and Equipment - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 199.8	$ 205.2	$ 187.5
Operating leases, net book value of leased milling assets	49.6	53.9
Operating leases, accumulated depreciation	$ 82.1	$ 74.7

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

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- Definition

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

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