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