Stockholders' and Members' Equity, Investor Voting Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Oct. 28, 2016	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Investor Voting Warrants [Abstract]
Warrant liability		$ 0	$ 50,887
Recognized (income) expense		$ (800)	$ (1,300)	$ 33,200
Goldman and Beekman [Member]
Investor Voting Warrants [Abstract]
Number of shares issued (in shares)			2,148,806
Investor Voting Warrants [Member]
Investor Voting Warrants [Abstract]
Common unit warrants issued (in shares)	25,000
Common unit warrants in exchange price	$ 1,000
Common unit warrants term (in years)	10 years
Common units redemption term (in years)	5 years
Warrants exercise price per unit (in dollars per share)	$ 0.0001