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Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | $ 208,812 | $ 196,253 | $ 205,161
United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 145,886 | 135,590 | 142,090
Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 62,926 | 60,663 | 63,071
United Kingdom Plan, Defined Benefit [Member] |  |  |
Fair value of plan assets | 50,914 |  |
Japan Plan, Defined Benefit [Member] |  |  |
Fair value of plan assets | 12,012 |  |
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 | 6,904 | 668 |
Pooled funds: Index linked U.K. government securities fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 5,009 | 4,716 |
Pooled funds: Index linked U.K. long-term government securities fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 11,998 | 10,583 |
Mutual funds: U.S. corporate bond fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 56,813 | 56,210 |
Pooled funds: Index linked U.K. corporate bonds fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 16,180 | 16,613 |
Pooled funds: Japanese fixed income securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 5,321 | 4,805 |
Pooled funds: International fixed income securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,777 | 1,624 |
Mutual funds: U.S. equity large cap fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 48,506 | 47,517 |
Mutual funds: International equity large cap growth fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 33,834 | 31,396 |
Pooled funds: Japanese equity securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,536 | 2,116 |
Pooled funds: International equity securities [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,258 | 1,982 |
Pooled funds: Index linked U.K. equity fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 7,982 | 8,687 |
Pooled funds: Index linked international equity fund [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 9,694 | 9,336 |
Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Fair value of plan assets | 145,894 | 135,590 |
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 163 | 201 |
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 | 6,741 | 467 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 163 | 201 |
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 | 56,813 | 56,210 |
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 | 48,506 | 47,517 |
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 | 33,834 | 31,396 |
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 62,755 | 60,462 |
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 | 5,009 | 4,716 |
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 | 11,998 | 10,583 |
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 | 16,180 | 16,613 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 5,321 | 4,805 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 1,777 | 1,624 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,536 | 2,116 |
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member] |  |  |
Fair value of plan assets | 2,258 | 1,982 |
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 | 7,982 | 8,687 |
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 | $ 9,694 | $ 9,336 |

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