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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
RETIREMENT PLANS |  |  |  |
Interest cost | $ 616 | $ 875 | $ 2,264 | $ 2,626
Expected return on assets | (1,067) | (1,086) | (3,149) | (3,259)
Actuarial loss | (715) | (487) | (1,801) | (1,461)
Net periodic benefit cost | $ 264 | $ 276 | $ 916 | $ 828

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