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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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- Definition 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 + Details
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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 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 + 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. + Details
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