Retirement Benefits (Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Net (gain) loss	$ 3,088	$ (7,873)	$ 25,311
Prior service (benefit) cost	0	3,963	(1,427)
Amortization of net (gains) losses	(1,339)	(1,525)	(574)
Amortization of transition obligation asset	0	(86)	(84)
Amortization of prior service benefit (cost)	805	1,517	3,499
Settlement loss	0	(345)	(246)
Foreign currency exchange rate changes	376	(60)	311
Total recognized in accumulated other comprehensive income	(2,930)	4,409	(26,790)
Pension Plans, Defined Benefit [Member]
Net (gain) loss	6,233	(3,949)
Prior service (benefit) cost	0	3,963
Amortization of net (gains) losses	(1,211)	(1,336)
Amortization of transition obligation asset	0	(86)
Amortization of prior service benefit (cost)	(66)	268
Settlement loss	0	(345)
Foreign currency exchange rate changes	376	(60)
Total recognized in accumulated other comprehensive income	5,332	(1,545)
United States Pension Plans of US Entity, Defined Benefit [Member]
Net (gain) loss	7,897	(6,182)
Prior service (benefit) cost	0	3,963
Amortization of net (gains) losses	(312)	(583)
Amortization of transition obligation asset	0	0
Amortization of prior service benefit (cost)	(75)	260
Settlement loss	0	0
Foreign currency exchange rate changes	0	0
Total recognized in accumulated other comprehensive income	7,510	(2,542)
Foreign Pension Plans, Defined Benefit [Member]
Net (gain) loss	(1,664)	2,233
Prior service (benefit) cost	0	0
Amortization of net (gains) losses	(899)	(753)
Amortization of transition obligation asset	0	(86)
Amortization of prior service benefit (cost)	9	8
Settlement loss	0	(345)
Foreign currency exchange rate changes	376	(60)
Total recognized in accumulated other comprehensive income	(2,178)	997
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net (gain) loss	(3,145)	(3,924)
Amortization of net (gains) losses	(128)	(189)
Amortization of prior service benefit (cost)	871	1,249
Total recognized in accumulated other comprehensive income	$ (2,402)	$ (2,864)