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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, 2020 | Sep. 30, 2019
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Amounts Recognized in the Consolidated Balance Sheets |  |
Accrued liabilities | $ (18) | $ (50)
Noncurrent liabilities-other | (30,025) | (28,653)
Net amount recognized | (30,043) | (28,703)
Amounts recognized in accumulated other comprehensive income and not yet reflected in net periodic benefit cost |  |
Net actuarial loss | $ (33,923) | $ (37,084)

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