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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. + Details
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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 + Details
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