Retirement Benefit Plans (Details 7)	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Asset Allocation Range provides flexibility for the Plan's investments
Percent of Plan Assets	100.00%	100.00%
U.S. equities [Member]
Asset Allocation Range provides flexibility for the Plan's investments
Percent of Plan Assets	50.00%	48.00%
Asset Allocations Range Minimum	30.00%
Asset Allocations Range Maximum	70.00%
Non-U.S. equities [Member]
Asset Allocation Range provides flexibility for the Plan's investments
Percent of Plan Assets	7.00%	7.00%
Asset Allocations Range Minimum	0.00%
Asset Allocations Range Maximum	20.00%
U.S. debt securities [Member]
Asset Allocation Range provides flexibility for the Plan's investments
Percent of Plan Assets	41.00%	42.00%
Asset Allocations Range Minimum	20.00%
Asset Allocations Range Maximum	70.00%
Non-U.S. debt securities [Member]
Asset Allocation Range provides flexibility for the Plan's investments
Percent of Plan Assets	1.00%	2.00%
Asset Allocations Range Minimum	0.00%
Asset Allocations Range Maximum	10.00%
Other securities [Member]
Asset Allocation Range provides flexibility for the Plan's investments
Percent of Plan Assets	1.00%	1.00%
Asset Allocations Range Minimum	0.00%
Asset Allocations Range Maximum	60.00%

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

+ Details

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(1)

-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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