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Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | --- | ---
Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | $ 196,253 | $ 205,161 | $ 190,175
United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 135,590 | 142,090 | 129,518
Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 60,663 | 63,071 | 60,657
United Kingdom Plan, Defined Benefit [Member] |  |  |
Fair value of plan assets | 50,033 |  |
Japan Plan, Defined Benefit [Member] |  |  |
Fair value of plan assets | 10,630 |  |
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 | 668 | 484 |
Pooled funds: Index linked U.K. government securities fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,716 | 4,566 |
Pooled funds: Index linked U.K. long-term government securities fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 10,583 | 5,569 |
Mutual funds: U.S. corporate bond fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 56,210 | 56,559 |
Pooled funds: Index linked U.K. corporate bonds fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 16,613 | 16,897 |
Pooled funds: Japanese fixed income securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,805 | 4,676 |
Pooled funds: International fixed income securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,624 | 1,638 |
Mutual funds: U.S. equity large cap fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 47,517 | 49,220 |
Mutual funds: International equity large cap growth fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 31,396 | 35,995 |
Pooled funds: Japanese equity securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,116 | 2,330 |
Pooled funds: International equity securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,982 | 2,067 |
Pooled funds: Index linked U.K. equity fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 8,687 | 6,240 |
Pooled funds: Index linked international equity fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 9,336 | 6,593 |
Equity Funds [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets |  | 12,327 |
Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 135,590 | 142,090 |
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 201 | 168 |
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 | 467 | 316 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 201 | 168 |
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 | 56,210 | 56,559 |
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 | 47,517 | 49,220 |
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 | 31,396 | 35,995 |
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 60,462 | 62,903 |
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 | 4,716 | 4,566 |
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 | 10,583 | 5,569 |
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 | 16,613 | 16,897 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 4,805 | 4,676 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,624 | 1,638 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,116 | 2,330 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,982 | 2,067 |
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 | 8,687 | 6,240 |
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 | $ 9,336 | 6,593 |
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets |  | $ 12,327 |

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