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Pension and Other Postretirement Benefits - Significant Assumptions to Determine the Present Value of Net Benefit Obligations and the Net Periodic Costs (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Annual assumed rate of increase in per capita cost of covered benefits for postretirement benefit plans
Health Care Cost Trend Rate Assumed for Next Year	7.25%	7.50%	7.80%
Rate to which the Cost Trend Rate Gradually Declines	5.00%	5.00%	4.50%
Year that the Rate Reaches the Rate at which it is assumed to Remain	2024	2024	2029
Calculated effect of change on assumption used to calculate cost components and obligations of healthcare plans
Effect on Total Service and Interest Cost Components, Increase	$ 45
Effect on Total Service and Interest Cost Components, Decrease	(40)
Effect on Other Postretirement Obligation, Increase	881
Effect on Other Postretirement Obligation, Decrease	$ (790)

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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-Publisher FASB



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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Health Care Cost Trend Rate



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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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