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Benefit Plans Textuals (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Benefit Plans (Textuals) [Abstract] |  |  |
Percentage of defined contribution plan by plan participants | 50.00% |  |
Assumed health care cost trend rates used in measuring the accumulated benefit obligation for retiree health care benefits | 7.00% | 6.80% |
Assumed health care cost trend rates used in measuring the accumulated benefit obligation for retiree health care 2027 rate | 5.00% |  |
Pension Benefits [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Estimated net actuarial gain (loss) | $ (872) |  |
Estimated prior service cost | (86) |  |
Expected contribution to benefit plans in 2017 | 750 |  |
Postretirement Health Coverage [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Estimated net actuarial gain (loss) | 181 |  |
Estimated prior service cost | 271 |  |
Expected contribution to benefit plans in 2017 | 180 |  |
401(k) [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Defined contribution plan cost | 2,535 | $ 3,156 | $ 2,788
KERP [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Defined contribution plan cost | $ 268 | $ 300 | $ 234

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- Definition Percentage of defined contribution plan by plan participants. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition 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 -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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