Related Party Transactions (ICM) (Narrative) (Details) - ICM [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Unit Agreement [Member]
Related Party Transaction [Line Items]
Selling Rights, Greater of Minimum Unit Price or Fair Market Value	$ 10,897
Related Party Transaction, Expenses from Transactions with Related Party		$ 300
Capital Unit Class C [Member]
Related Party Transaction [Line Items]
Selling Rights, Units	1,000
Capital Unit, Class A [Member]
Related Party Transaction [Line Items]
Selling Rights, Units	18