Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Pension Plans, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Other non-current assets	$ 0	$ 694
Other non-current liabilities	(24,137)	(12,542)
Net over/(under)funded status at end of year	(24,137)	(11,848)
Amounts recognized in accumulated other comprehensive loss (income) consist of:
Unrecognized net prior service (benefit) cost	3,857	4,241
Unrecognized net (gains) losses	54,477	40,479
Total amounts recognized	58,334	44,720	$ 26,393
Deferred taxes	(21,608)	(16,707)
Amounts recognized in accumulated other comprehensive loss (income)	36,726	28,013
United States Pension Plans of US Entity, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Other non-current assets	0	0
Other non-current liabilities	(15,006)	(10,280)
Net over/(under)funded status at end of year	(15,006)	(10,280)
Amounts recognized in accumulated other comprehensive loss (income) consist of:
Unrecognized net prior service (benefit) cost	3,857	4,241
Unrecognized net (gains) losses	33,682	26,861
Total amounts recognized	37,539	31,102	14,491
Deferred taxes	(14,305)	(11,890)
Amounts recognized in accumulated other comprehensive loss (income)	23,234	19,212
Foreign Pension Plans, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Other non-current assets	0	694
Other non-current liabilities	(9,131)	(2,262)
Net over/(under)funded status at end of year	(9,131)	(1,568)
Amounts recognized in accumulated other comprehensive loss (income) consist of:
Unrecognized net prior service (benefit) cost	0	0
Unrecognized net (gains) losses	20,795	13,618
Total amounts recognized	20,795	13,618	11,902
Deferred taxes	(7,303)	(4,817)
Amounts recognized in accumulated other comprehensive loss (income)	13,492	8,801
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Accrued liabilities	(2,505)	(2,481)
Other non-current liabilities	(33,125)	(32,446)
Net over/(under)funded status at end of year	(35,630)	(34,927)
Amounts recognized in accumulated other comprehensive loss (income) consist of:
Unrecognized net prior service (benefit) cost	(318)	(477)
Unrecognized net (gains) losses	5,484	3,745
Total amounts recognized	5,166	3,268	$ (3,666)
Deferred taxes	(1,979)	(1,267)
Amounts recognized in accumulated other comprehensive loss (income)	$ 3,187	$ 2,001