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Pension and Retirement Plans - Accrued benefit liability (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Liability, Defined Benefit Plan [Abstract] |  |
Current accrued benefit liability | $ 335 | $ 340
Non-current accrued benefit liability | 6,904 | 6,168
Total accrued benefit liability | 7,239 | 6,508
Accumulated other comprehensive income | 6,302 | $ 5,298
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year | 229 |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 400 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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