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Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details) | Jun. 30, 2021 | Jun. 30, 2020
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Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 71.00% | 66.00%
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 21.00% | 27.00%
Common-collective funds - Global asset allocation/risk parity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 7.00% | 5.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 1.00% | 2.00%
Minimum | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 65.00% |
Minimum | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 10.00% |
Minimum | Common-collective funds - Global asset allocation/risk parity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 0.00% |
Minimum | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 0.00% |
Maximum | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 85.00% |
Maximum | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 30.00% |
Maximum | Common-collective funds - Global asset allocation/risk parity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 15.00% |
Maximum | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation for 2022 | 10.00% |

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- Definition Percentage of investment to total investment within defined benefit plan asset category. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Percentage of target 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/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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