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EMPLOYEE BENEFIT PLANS - Amounts Recognized in the Consolidated Balance Sheets and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Amounts Recognized in the Consolidated Balance Sheets |  |
Accrued liabilities | $ 0 | $ (18)
Noncurrent liabilities-other | (23,097) | (30,025)
Net amount recognized | (23,097) | (30,043)
Amounts recognized in accumulated other comprehensive income and not yet reflected in net periodic benefit cost |  |
Net actuarial loss | $ 26,268 | $ 33,923

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