Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	$ 198
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	125
Mutual funds: U.S. corporate bond fund [Member] | Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	36,958
Mutual funds: U.S. equity large cap fund [Member] | Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	29,169
Mutual funds: International equity large cap growth fund [Member] | Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	23,655
Fair Value, Inputs, Level 1 [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	89,980
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	125
Pooled funds: Index linked U.K. government securities fund [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	3,646
Pooled funds: Index linked U.K. long-term government securities fund [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	6,440
Pooled funds: Index linked U.K. corporate bonds fund [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	13,255
Pooled funds: Japanese fixed income securities [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	3,958
Pooled funds: International fixed income securities [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,336
Pooled funds: Japanese equity securities [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,921
Pooled funds: International equity securities [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,652
Pooled funds: Index linked U.K. equity fund [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	7,098
Pooled funds: Index linked international equity fund [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	7,062
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	46,368
Insurance Backed Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,874
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,874
Cash and Cash Equivalents [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	323
Pooled funds: Index linked U.K. government securities fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	3,646
Pooled funds: Index linked U.K. long-term government securities fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	6,440
Pooled funds: Index linked U.K. long-term government securities fund [Member] | United Kingdom Plan, Defined Benefit [Member]
Fair value of plan assets		5,707
Mutual funds: U.S. corporate bond fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	36,958
Pooled funds: Index linked U.K. corporate bonds fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	13,255
Pooled funds: Japanese fixed income securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	3,958
Pooled funds: International fixed income securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,336
Mutual funds: U.S. equity large cap fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	29,169
Mutual funds: International equity large cap growth fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	23,655
Pooled funds: Japanese equity securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,921
Pooled funds: International equity securities [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,652
Pooled funds: Index linked U.K. equity fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	7,098
Pooled funds: Index linked international equity fund [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	7,062
Insurance Backed Assets [Member] | Pension Plans, Defined Benefit [Member]
Fair value of plan assets	1,874
Pension Plans, Defined Benefit [Member]
Fair value of plan assets	138,347	128,667	104,828
United States Pension Plans of US Entity, Defined Benefit [Member]
Fair value of plan assets	89,980	85,128	64,102
Foreign Pension Plans, Defined Benefit [Member]
Fair value of plan assets	48,367	43,539	40,726
United Kingdom Plan, Defined Benefit [Member]
Fair value of plan assets	37,546
Japan Plan, Defined Benefit [Member]
Fair value of plan assets	8,947
Switzerland Plan, Defined Benefit [Member]
Fair value of plan assets	1,874
Other Postretirement Benefit Plans, Defined Benefit [Member]
Fair value of plan assets	$ 0	$ 0	$ 0