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Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	$ 78,385	$ 72,063
Government
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	24,013	20,663
Corporate Investment Grade
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	2,924	3,599
Large Capitalization Stocks
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	27,078	23,878
Commodity Option
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,558	7,750
Insurance Company Funds
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	9,105	9,131
Options
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	1,122	1,126
Cash
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	5,585	5,916
Level 1
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	69,280	62,932
Level 1 | Government
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	24,013	20,663
Level 1 | Corporate Investment Grade
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	2,924	3,599
Level 1 | Large Capitalization Stocks
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	27,078	23,878
Level 1 | Commodity Option
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,558	7,750
Level 1 | Options
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	1,122	1,126
Level 1 | Cash
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	5,585	5,916
Level 2
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	9,105	9,131
Level 2 | Insurance Company Funds
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	$ 9,105	$ 9,131

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Fair Value of Plan Assets [Line Items]

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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