Fair Value Measurement (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)	12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)
Derivative [Line Items]
Assets: Derivative financial instruments	$ 78,000	$ 1,046,000
Liabilities: Derivative financial instruments	$ 597,000	$ 1,567,000
Warrant Option, Expected Dividend Yield	0.00%	0.00%
Warrant Option, Risk-free interest	0.00%	2.57%
Warrant Option, Expected Volatility	0.00%	22.00%
Warrant Option, Expected Life	0	1.25
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 10,897	$ 10,897
Share Price | $ / shares	$ 4,967	$ 5,500
Increase (Decrease) in Put Options	$ 637,000	$ (300,000)
Level 1 [Member]
Derivative [Line Items]
Liabilities: Derivative financial instruments	364,000,000	82,000
Warrants and Rights Outstanding	0	0
Level 2 [Member]
Derivative [Line Items]
Assets: Derivative financial instruments	0	0
Warrants and Rights Outstanding	0	0
Level 3 [Member]
Derivative [Line Items]
Assets: Derivative financial instruments	0	0
Liabilities: Derivative financial instruments	0	0
Warrants and Rights Outstanding	6,037,000	5,400,000	$ 5,700,000
Increase (Decrease) in Put Options	637,000	(300,000)
Futures And Option Contracts In Gain Position [Member]
Derivative [Line Items]
Assets: Derivative financial instruments	368,000	$ 583,000
Reported Value Measurement [Member] | Level 3 [Member]
Derivative [Line Items]
Warrants and Rights Outstanding	6,000,000.0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member]
Derivative [Line Items]
Warrants and Rights Outstanding	$ 5,400,000