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OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Other Income and Expenses [Abstract] |  |  |
Other income (expense) | $ 3,331 | $ 2,885 | $ 5,230
Currency exchange gains (losses) | (81) | (915) | (438)
Investment income (loss) | 283 | 184 | (40)
Net periodic benefit cost (credit) | (907) | (1,559) | (3,148)
Rental income | $ 1,848 | $ 1,848 | $ 1,848

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