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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
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

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