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Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details 5) | 12 Months Ended |
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Jun. 30, 2015 | Jun. 30, 2014
Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2015 minimum |  | 10.00% |
Target allocation for 2015 maximum |  | 35.00% |
Percentage of Plan Assets |  | 19.00% | 20.00%
Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2015 minimum |  | 20.00% |
Target allocation for 2015 maximum |  | 50.00% |
Percentage of Plan Assets |  | 35.00% | 35.00%
Global asset allocation/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2015 minimum | [1] | 20.00% |
Target allocation for 2015 maximum | [1] | 40.00% |
Percentage of Plan Assets | [1] | 35.00% | 35.00%
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for 2015 minimum |  | 0.00% |
Target allocation for 2015 maximum |  | 25.00% |
Percentage of Plan Assets |  | 11.00% | 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 Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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