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Pension and Retirement Plans - Accrued benefit liability (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit liability	$ 308	$ 321
Non-current accrued benefit liability	4,097	6,471
Total accrued benefit liability	4,405	6,792
Accumulated other comprehensive income	4,218	$ 6,120
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	146
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 400

X

- Definition

Amount, after 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 cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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