Organization and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense	$ (2,431)	$ (5,455)
Basic earnings per common share (in dollars per share)	$ 0.28	$ 0.08
Diluted earnings per common share (in dollars per share)	$ (0.21)	$ (0.08)
Adjustments | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense	$ 3,400
Basic earnings per common share (in dollars per share)	$ 0.05
Diluted earnings per common share (in dollars per share)	$ 0.02