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Postretirement Benefits (Net Periodic Benefit Costs Assumptions) (Details) - Postretirement Benefits [Member] | 12 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.02% | 4.57% | 3.78%
Pre Medicare [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate | 7.50% | 8.00% | 10.00%
Medicare [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate | 6.75% | 7.00% | 7.00%

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- Definition The beginning-of-the-year estimated health care cost trend rate used in calculating net periodic benefit cost for our postretirement benefit plans. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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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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- Details
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- Details
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