Net Income (Loss) Per Share/Unit - Computation of Basic and Diluted Net Loss Per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) - Diluted	$ (46,869)	$ 35,144
Less: Dividends on preferred units	(1,491)	(3,535)
Net income (loss) attributable to common shareholders/unitholders - Basic	$ (48,360)	$ 31,609
Basic weighted-average common shares/units outstanding (in Shares/Units)	16,021	12,457
Effecting of dilutive securities:
Series A preferred units (in Units)	0	3,999
Restricted shares/units (in Shares/Units)	0	53
Diluted weighted-average common shares/units outstanding (in Shares/Units)	16,021	16,509
Continuing Operations, Basic net income (loss) per common share/unit (USD per Share/Unit)	$ (3.02)	$ 2.54
Continuing Operations, Diluted net income (loss) per common share/unit (USD per Share/Unit)	$ (3.02)	$ 2.13