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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
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Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 808,635 | $ 821,675
NAV [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 132,487 | 115,438
Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 88,451 | 77,192
Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 587,697 | 629,045
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 | 365,723 | 395,102
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 | 365,723 | 395,102
Value Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 76,186 | 68,731
Growth Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 43,880 | 38,126
Balanced Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 12,421 | 8,581
Common Stock [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 85,138 | 74,163
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 | 85,138 | 74,163
US Government Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 72,817 | 79,275
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 | 72,817 | 79,275
Foreign Government Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 45,359 | 43,729
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 | 45,359 | 43,729
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 | 25,761 | 31,503
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 | 25,761 | 31,503
Other [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 81,350 | 82,465
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 | 3,313 | 3,029
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 | $ 78,037 | $ 79,436

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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