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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Jun. 30, 2014
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Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 827,337 | $ 884,264
Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 98,360 | 104,683
Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 728,977 | 779,581
Corporate Fixed Income Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 391,275 | 409,167
Corporate Fixed Income Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 391,275 | 409,167
Value Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 102,466 | 117,479
Value Funds [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 102,466 | 117,479
Growth Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 54,179 | 64,830
Growth Funds [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 54,179 | 64,830
Balanced Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 10,090 | 22,262
Balanced Funds [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 10,090 | 22,262
Common Stock [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 94,964 | 101,527
Common Stock [Member] | Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 94,964 | 101,527
US Government Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 68,628 | 66,709
US Government Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 68,628 | 66,709
Foreign Government Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 44,474 | 41,202
Foreign Government Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 44,474 | 41,202
Other Fixed Income Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 32,540 | 36,469
Other Fixed Income Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 32,540 | 36,469
Other [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 28,721 | 24,619
Other [Member] | Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 3,396 | 3,156
Other [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 25,325 | $ 21,463

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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