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Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details 5) | Jun. 30, 2018 | Jun. 30, 2017
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Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets |  | 63.00% | 33.00%
Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets |  | 26.00% | 38.00%
Global asset allocation/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | [1] | 10.00% | 17.00%
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets |  | 1.00% | 12.00%
Minimum | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 |  | 55.00% |
Minimum | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 |  | 15.00% |
Minimum | Global asset allocation/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 | [1] | 0.00% |
Minimum | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 |  | 0.00% |
Maximum | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 |  | 75.00% |
Maximum | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 |  | 35.00% |
Maximum | Global asset allocation/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 | [1] | 20.00% |
Maximum | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2018 |  | 10.00% |
[1] | The global asset allocation/risk parity category consists of a variety of asset classes including, but not limited to, global bonds, global equities, real estate and commodities.

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- Definition Percentage of investment to total investment within defined benefit plan asset category. + 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=112275985&loc=d3e4179-114921 Reference 2: 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=108410482&loc=d3e1928-114920 + 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=112275985&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=108410482&loc=d3e1928-114920 + Details
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