Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
Fair value of plan assets	$ 190,175	$ 161,503	$ 138,347
United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	129,518	105,966	89,980
Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	60,657	55,537	48,367
United Kingdom Plan, Defined Benefit [Member]
Fair value of plan assets	48,381
Japan Plan, Defined Benefit [Member]
Fair value of plan assets	10,300
Switzerland Plan, Defined Benefit [Member]
Fair value of plan assets	1,976
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	422
Pooled funds: Index linked U.K. government securities fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	4,176
Pooled funds: Index linked U.K. long-term government securities fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	4,908
Mutual funds: U.S. corporate bond fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	49,328
Pooled funds: Index linked U.K. corporate bonds fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	15,810
Pooled funds: Japanese fixed income securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	4,414
Pooled funds: International fixed income securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,535
Mutual funds: U.S. equity large cap fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	44,140
Mutual funds: International equity large cap growth fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	35,777
Pooled funds: Japanese equity securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	2,269
Pooled funds: International equity securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,989
Pooled funds: Index linked U.K. equity fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	6,060
Pooled funds: Index linked international equity fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	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	11,324
Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	129,518
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	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	273
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	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	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	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	35,777
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	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	4,176
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	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	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	4,414
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International fixed income securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,535
Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	2,269
Fair Value, Inputs, Level 2 [Member] | Pooled funds: International equity securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	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	6,060
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	6,047
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	11,324
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,976	1,862
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