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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
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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

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