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Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | --- | ---
Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | $ 205,161 | $ 190,175 | $ 161,503
United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 142,090 | 129,518 | 105,966
Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 63,071 | 60,657 | 55,537
United Kingdom Plan, Defined Benefit [Member] |  |  |
Fair value of plan assets | 52,260 |  |
Japan Plan, Defined Benefit [Member] |  |  |
Fair value of plan assets | 10,811 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 0 | 0 | 0
Cash and Cash Equivalents [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 484 | 422 |
Pooled funds: Index linked U.K. government securities fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,566 | 4,176 |
Pooled funds: Index linked U.K. long-term government securities fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 5,569 | 4,908 |
Mutual funds: U.S. corporate bond fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 56,559 | 49,328 |
Pooled funds: Index linked U.K. corporate bonds fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 16,897 | 15,810 |
Pooled funds: Japanese fixed income securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,676 | 4,414 |
Pooled funds: International fixed income securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,638 | 1,535 |
Mutual funds: U.S. equity large cap fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 49,220 | 44,140 |
Mutual funds: International equity large cap growth fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 35,995 | 35,777 |
Pooled funds: Japanese equity securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,330 | 2,269 |
Pooled funds: International equity securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,067 | 1,989 |
Pooled funds: Index linked U.K. equity fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 6,240 | 6,060 |
Pooled funds: Index linked international equity fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 6,593 | 6,047 |
Insurance Backed Assets [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets |  | 1,976 |
Equity Funds [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 12,327 | 11,324 |
Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 142,090 | 129,518 |
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 168 | 149 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 316 | 273 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 168 | 149 |
Fair Value, Inputs, Level 1 [Member] | Mutual funds: U.S. corporate bond fund [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 56,559 | 49,328 |
Fair Value, Inputs, Level 1 [Member] | Mutual funds: U.S. equity large cap fund [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 49,220 | 44,140 |
Fair Value, Inputs, Level 1 [Member] | Mutual funds: International equity large cap growth fund [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 35,995 | 35,777 |
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 62,903 | 58,532 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. government securities fund [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,566 | 4,176 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 5,569 | 4,908 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 16,897 | 15,810 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,676 | 4,414 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,638 | 1,535 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,330 | 2,269 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,067 | 1,989 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. equity fund [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 6,240 | 6,060 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked international equity fund [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 6,593 | 6,047 |
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 12,327 | 11,324 |
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets |  | 1,976 |
Fair Value, Inputs, Level 3 [Member] | Insurance Backed Assets [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets |  | $ 1,976 |

X
- 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. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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