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Retirement Benefits (Schedule of Net Perioodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Pension Plans, Defined Benefit [Member]      
Service cost $ 2,444 $ 2,802 $ 4,504
Interest cost 6,873 8,084 8,792
Expected return on plan assets (12,799) (13,679) (12,883)
Amortization of: Net (gains) losses 1,538 586 985
Amortization of: Prior service (benefit) cost 384 383 93
Settlement loss 47 0 0
Curtailment (gain) loss 0 0 (7,539)
Net periodic retirement (benefit) cost (1,513) (1,824) (6,048)
United States Pension Plans of US Entity, Defined Benefit [Member]      
Service cost 1,695 2,018 3,516
Interest cost 5,236 5,956 6,382
Expected return on plan assets (10,140) (10,647) (9,813)
Amortization of: Net (gains) losses 1,292 396 330
Amortization of: Prior service (benefit) cost 384 383 97
Settlement loss 47 0 0
Curtailment (gain) loss 0 0 (6,624)
Net periodic retirement (benefit) cost (1,486) (1,894) (6,112)
Foreign Pension Plans, Defined Benefit [Member]      
Service cost 749 784 988
Interest cost 1,637 2,128 2,410
Expected return on plan assets (2,659) (3,032) (3,070)
Amortization of: Net (gains) losses 246 190 655
Amortization of: Prior service (benefit) cost 0 0 (4)
Settlement loss 0 0 0
Curtailment (gain) loss 0 0 (915)
Net periodic retirement (benefit) cost (27) 70 64
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Service cost 22 30 47
Interest cost 1,048 1,233 1,432
Amortization of: Net (gains) losses 156 (73) (200)
Amortization of: Prior service (benefit) cost (158) (158) (158)
Net periodic retirement (benefit) cost $ 1,068 $ 1,032 $ 1,121