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Benefit Plans Textuals (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
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% |  |
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) | $ (424) |  |
Estimated prior service cost | (27) |  |
Expected contribution to benefit plans in 2017 | 2,820 |  |
Postretirement Health Coverage [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Estimated net actuarial gain (loss) | (155) |  |
Estimated prior service cost | (369) |  |
Expected contribution to benefit plans in 2017 | 190 |  |
401(k) [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Defined contribution plan cost | 6,677 | $ 2,535 | $ 3,156
KERP [Member] |  |  |
Benefit Plans (Textuals) [Abstract] |  |  |
Defined contribution plan cost | $ 289 | $ 268 | $ 300

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- Definition Benefit plans. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + 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=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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=82843861&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + 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=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + 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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