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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Sep. 30, 2021
Stockholders' Equity Note [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Income (Loss) | Components of accumulated other comprehensive loss were as follows:
| September 30,
(in thousands) | 2021 |  | 2020 |  | 2019
Pre-tax amounts: |  |  |  |  |
Unrealized actuarial loss | (26,268) |  |  | (33,923) |  |  | (37,084) |
| $ | (26,268) |  |  | $ | (33,923) |  |  | $ | (37,084) |
After-tax amounts: |  |  |  |  |
Unrealized actuarial loss | (20,244) |  |  | (26,188) |  |  | (28,635) |
| $ | (20,244) |  |  | $ | (26,188) |  |  | $ | (28,635) |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | The following is a summary of the changes in accumulated other comprehensive loss, net of tax, by component for the fiscal year ended September 30, 2021:
(in thousands) | Defined Benefit Pension Plan
Balance at September 30, 2020 | $ | (26,188) |
Activity during the period |
Amounts reclassified from accumulated other comprehensive loss | 5,944 |
Net current-period other comprehensive loss | 5,944 |
Balance at September 30, 2021 | $ | (20,244) |

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