Fair Value Measurement (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Fair Value, Put Option Liability	$ 5,400	$ 5,400
Warrants and rights outstanding, risk-free interest rate	2.57%	2.57%
Warrants and rights outstanding, expected volatility	22.00%	22.00%
Put Option, Expected Life Expectancy	1 year 3 months	1 year 3 months
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 10,897	$ 10,897
Share Price	$ 5,500	$ 5,500
Warrants Not Settleable in Cash, Fair Value Disclosure	$ 5,400	$ 5,400	$ 5,700
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	(300)
Level 1 [Member]
Derivative [Line Items]
Derivative Assets	479	583
Liabilities: Derivative financial instruments	33	82
Fair Value, Put Option Liability	0	0
Level 2 [Member]
Derivative [Line Items]
Derivative Assets	0	0
Liabilities: Derivative financial instruments	523	1,567
Fair Value, Put Option Liability	0	0
Level 3 [Member]
Derivative [Line Items]
Derivative Assets	0	0
Liabilities: Derivative financial instruments	0	0
Fair Value, Put Option Liability	$ 5,400	$ 5,400