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