Retirement Benefits (Schedule of Accumulated and Projected Benefit Obligations and Fair Value of Plan Assets) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Pension Plans, Defined Benefit [Member]
Projected benefit obligation	$ (163,696)	$ (154,443)	$ (143,001)
Accumulated benefit obligation	(150,934)	(140,399)
Fair value of plan assets	138,347	128,667	104,828
United States Pension Plans of US Entity, Defined Benefit [Member]
Projected benefit obligation	(106,341)	(97,786)	(89,551)
Accumulated benefit obligation	(96,630)	(86,260)
Fair value of plan assets	89,980	85,128	64,102
Foreign Pension Plans, Defined Benefit [Member]
Projected benefit obligation	(57,355)	(56,657)	(53,450)
Accumulated benefit obligation	(54,304)	(54,139)
Fair value of plan assets	48,367	43,539	40,726
United Kingdom Plan, Defined Benefit [Member]
Projected benefit obligation	(39,677)
Fair value of plan assets	37,546
Japan Plan, Defined Benefit [Member]
Projected benefit obligation	(15,140)
Fair value of plan assets	8,947
Switzerland Plan, Defined Benefit [Member]
Projected benefit obligation	(2,538)
Fair value of plan assets	1,874
Other Postretirement Benefit Plans, Defined Benefit [Member]
Projected benefit obligation	(32,923)	(37,222)	(42,427)
Accumulated benefit obligation	(32,923)	(37,222)
Fair value of plan assets	$ 0	$ 0	$ 0

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 6

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph E1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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