Acquisition And Reorganization Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Acquisition and reorganization costs	$ 1,041			$ 0	$ 1,041	$ 3,802
Acquisition expenses that may not be consummated				0	0	232
Severance costs				0	1,041	$ 3,486
Payments for postemployment benefits				$ 1,002	$ 2,677
Scenario, Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Payments for postemployment benefits		$ 0	$ 302