Pension Plans (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning Balance, value	$ 860,171	$ 853,889
Ending Balance, value	842,666	860,171
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning Balance, value	28,339	95,925
Recognized during year - net actuarial (losses)	(2,288)	(4,388)
Occurring during year - settlement loss	0	(66,332)
Occurring during year - net actuarial losses	12,119	6,445
Foreign exchange impact	497	(3,311)
Ending Balance, value	38,667	28,339
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | U.S. Plan [Member]
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning Balance, value	0	68,256
Recognized during year - net actuarial (losses)	0	(2,577)
Occurring during year - settlement loss	0	(66,332)
Occurring during year - net actuarial losses	0	653
Foreign exchange impact	0	0
Ending Balance, value	0	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | International Plans [Member]
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning Balance, value	28,339	27,669
Recognized during year - net actuarial (losses)	(2,288)	(1,811)
Occurring during year - settlement loss	0	0
Occurring during year - net actuarial losses	12,119	5,792
Foreign exchange impact	497	(3,311)
Ending Balance, value	$ 38,667	$ 28,339