Fair Value Of Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Nov. 30, 2014	Aug. 31, 2014
Fair Value Of Financial Instruments [Abstract]
Cash equivalents carried at cost	$ 36.3us-gaap_CashEquivalentsAtCarryingValue	$ 34.4us-gaap_CashEquivalentsAtCarryingValue
Fixed Rate Notes, fair value	435.4us-gaap_LongTermDebtFairValue	437.8us-gaap_LongTermDebtFairValue
Fixed rate notes, carrying value, including accrued interest	$ 435.4	$ 437.8

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_CashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant