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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
RETIREMENT PLANS |  |  |  |
Interest cost | $ 875 | $ 821 | $ 2,626 | $ 2,461
Expected return on plan assets | (1,086) | (975) | (3,259) | (2,924)
Actuarial loss | (487) | (548) | (1,461) | (1,644)
Net periodic benefit cost | $ 276 | $ 394 | $ 828 | $ 1,181

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