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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
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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- References

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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

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