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Defined Benefit Pension Plan - Expected Return on Assets (Details)	Sep. 30, 2021	Sep. 30, 2020
Defined benefit pension plan
Total	100.00%	100.00%
Equity securities
Defined benefit pension plan
Total	21.00%	20.60%
Corporate bonds
Defined benefit pension plan
Total	53.00%	53.00%
Diversified fund
Defined benefit pension plan
Total	26.00%	26.00%
Cash
Defined benefit pension plan
Total	0.00%	0.40%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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