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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Statement of Stockholders' Equity [Abstract] |  |  |
Dividend declared per share (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.40
Unrealized gain on derivative asset | $ 31,769 |  |
Unrealized loss on marketable securities, tax | (3,729) | $ 0 | $ 0
Actuarial gains (losses) | $ (121) | $ (77) | $ 27

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