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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
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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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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