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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	$ 821,675	$ 827,337
Level 1 [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	77,192	98,360
Level 2 [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	744,483	728,977
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	395,102	391,275
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	395,102	391,275
Value Funds [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	68,731	102,466
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	68,731	102,466
Growth Funds [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	38,126	54,179
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	38,126	54,179
Balanced Funds [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	8,581	10,090
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	8,581	10,090
Common Stock [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	74,163	94,964
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	74,163	94,964
US Government Securities [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	79,275	68,628
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	79,275	68,628
Foreign Government Securities [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	43,729	44,474
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	43,729	44,474
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	31,503	32,540
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	31,503	32,540
Other [Member]
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract]
Defined Benefit Plans', Fair Value of Plan Assets	82,465	28,721
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	3,029	3,396
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	$ 79,436	$ 25,325

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- References

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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=49178875&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=58740216&loc=d3e1928-114920

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