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, 2015	Sep. 30, 2014	Sep. 30, 2013
Pension Plans, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 201,275	$ 190,423
Service cost	2,802	4,504	$ 5,660
Interest cost	8,084	8,792	7,682
Net actuarial (gains) losses	6,921	15,461
Contribution by participants	51	91
Benefits paid	(6,502)	(6,050)
Amounts paid by Company for Pension Protection Fund levy	0	(13)
Plan amendments	0	3,355
Settlements	0	(1,985)
Curtailments	0	(12,258)
Foreign currency exchange rate changes	(4,530)	(1,045)
Projected benefit obligation at end of year	208,101	201,275	190,423
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	205,161	190,175
Actual return on plan assets	440	20,976
Contributions by the company	1,568	2,962
Contributions by plan participants	51	91
Benefits paid	(6,502)	(6,050)
Settlements	0	(1,985)
Foreign currency exchange rate changes	(4,465)	(1,008)
Fair value of plan assets at end of year	196,253	205,161	190,175
Net over/(under)funded status at end of year	(11,848)	3,886
United States Pension Plans of US Entity, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	137,740	126,532
Service cost	2,018	3,516	4,608
Interest cost	5,956	6,382	5,569
Net actuarial (gains) losses	4,206	12,446
Contribution by participants	28	0
Benefits paid	(4,078)	(3,732)
Amounts paid by Company for Pension Protection Fund levy	0	0
Plan amendments	0	3,355
Settlements	0	0
Curtailments	0	(10,759)
Foreign currency exchange rate changes	0	0
Projected benefit obligation at end of year	145,870	137,740	126,532
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	142,090	129,518
Actual return on plan assets	(2,535)	15,764
Contributions by the company	85	540
Contributions by plan participants	28	0
Benefits paid	(4,078)	(3,732)
Settlements	0	0
Foreign currency exchange rate changes	0	0
Fair value of plan assets at end of year	135,590	142,090	129,518
Net over/(under)funded status at end of year	(10,280)	4,350
Foreign Pension Plans, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	63,535	63,891
Service cost	784	988	1,052
Interest cost	2,128	2,410	2,113
Net actuarial (gains) losses	2,715	3,015
Contribution by participants	23	91
Benefits paid	(2,424)	(2,318)
Amounts paid by Company for Pension Protection Fund levy	0	(13)
Plan amendments	0	0
Settlements	0	(1,985)
Curtailments	0	(1,499)
Foreign currency exchange rate changes	(4,530)	(1,045)
Projected benefit obligation at end of year	62,231	63,535	63,891
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	63,071	60,657
Actual return on plan assets	2,975	5,212
Contributions by the company	1,483	2,422
Contributions by plan participants	23	91
Benefits paid	(2,424)	(2,318)
Settlements	0	(1,985)
Foreign currency exchange rate changes	(4,465)	(1,008)
Fair value of plan assets at end of year	60,663	63,071	60,657
Net over/(under)funded status at end of year	(1,568)	(464)
United Kingdom Plan, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at end of year	52,295
Changes in fair value of plan assets:
Fair value of plan assets at end of year	50,033
Japan Plan, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at end of year	9,936
Changes in fair value of plan assets:
Fair value of plan assets at end of year	10,630
Other Postretirement Benefit Plans, Defined Benefit [Member]
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	29,225	28,996
Service cost	30	47	71
Interest cost	1,233	1,432	1,244
Net actuarial (gains) losses	6,705	1,145
Contribution by participants	1,613	1,843
Benefits paid	(3,848)	(4,243)
Foreign currency exchange rate changes	(31)	5
Projected benefit obligation at end of year	34,927	29,225	28,996
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	0	0
Contributions by the company	2,235	2,400
Contributions by plan participants	1,613	1,843
Benefits paid	(3,848)	(4,243)
Fair value of plan assets at end of year	0	0	$ 0
Net over/(under)funded status at end of year	$ (34,927)	$ (29,225)