Retirement Benefits (Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Pension Plans, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 208,101	$ 201,275
Service cost	2,444	2,802	$ 4,504
Interest cost	6,873	8,084	8,792
Net actuarial (gains) losses	34,976	6,921
Contribution by participants	67	51
Benefits paid	(12,445)	(6,502)
Settlements	47	0
Foreign currency exchange rate changes	(7,114)	(4,530)
Projected benefit obligation at end of year	232,949	208,101	201,275
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	196,253	205,161
Actual return (loss) on plan assets	30,061	440
Contributions by the Company	999	1,568
Contributions by plan participants	67	51
Benefits paid	(12,445)	(6,502)
Settlements	(47)	0
Foreign currency exchange rate changes	(6,076)	(4,465)
Fair value of plan assets at end of year	208,812	196,253	205,161
Net over/(under)funded status at end of year	(24,137)	(11,848)
United States Pension Plans of US Entity, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	145,870	137,740
Service cost	1,695	2,018	3,516
Interest cost	5,236	5,956	6,382
Net actuarial (gains) losses	17,786	4,206
Contribution by participants	47	28
Benefits paid	(9,789)	(4,078)
Settlements	47	0
Projected benefit obligation at end of year	160,892	145,870	137,740
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	135,590	142,090
Actual return (loss) on plan assets	19,859	(2,535)
Contributions by the Company	226	85
Contributions by plan participants	47	28
Benefits paid	(9,789)	(4,078)
Settlements	(47)	0
Fair value of plan assets at end of year	145,886	135,590	142,090
Net over/(under)funded status at end of year	(15,006)	(10,280)
Foreign Pension Plans, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	62,231	63,535
Service cost	749	784	988
Interest cost	1,637	2,128	2,410
Net actuarial (gains) losses	17,190	2,715
Contribution by participants	20	23
Benefits paid	(2,656)	(2,424)
Settlements	0	0
Foreign currency exchange rate changes	(7,114)	(4,530)
Projected benefit obligation at end of year	72,057	62,231	63,535
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	60,663	63,071
Actual return (loss) on plan assets	10,202	2,975
Contributions by the Company	773	1,483
Contributions by plan participants	20	23
Benefits paid	(2,656)	(2,424)
Settlements	0	0
Foreign currency exchange rate changes	(6,076)	(4,465)
Fair value of plan assets at end of year	62,926	60,663	63,071
Net over/(under)funded status at end of year	(9,131)	(1,568)
United Kingdom Plan, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at end of year	59,896
Changes in fair value of plan assets:
Fair value of plan assets at end of year	50,914
Japan Plan, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at end of year	12,161
Changes in fair value of plan assets:
Fair value of plan assets at end of year	12,012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	34,927	29,225
Service cost	22	30	47
Interest cost	1,048	1,233	1,432
Net actuarial (gains) losses	1,912	6,705
Contribution by participants	1,299	1,613
Benefits paid	(3,503)	(3,848)
Foreign currency exchange rate changes	(75)	(31)
Projected benefit obligation at end of year	35,630	34,927	29,225
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	0	0
Contributions by the Company	2,204	2,235
Contributions by plan participants	1,299	1,613
Benefits paid	(3,503)	(3,848)
Fair value of plan assets at end of year	0	0	$ 0
Net over/(under)funded status at end of year	$ (35,630)	$ (34,927)