Fair Values Of Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Aug. 31, 2012	Aug. 31, 2011
Fair Values Of Financial Instruments [Abstract]
Fixed Rate Notes, fair value	$ 510.8	$ 497.0
Fixed Rate Notes, carrying value, including accrued interest	$ 482.0	$ 497.0

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant