Accumulated Other Comprehensive Loss (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax [Roll Forward]
Beginning balance			$ (59,971)
Change during the period	$ 649	$ 18,706	18,134	$ 18,408
Ending balance	(78,105)		(78,105)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, After Tax [Roll Forward]
Beginning balance			26,866
Change during the period			3,123
Ending balance	29,989		29,989
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			33,105
Change during the period	1,218	$ (16,208)	(15,011)	$ (14,618)
Ending balance	$ 48,116		$ 48,116