Benefit Plans Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Benefit Plans (Textuals) [Abstract]
Net other periodic post-employment costs	$ 245	$ 796	$ 981
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]
Defined Benefit Plan, Service Cost	$ 124	126	91
Estimated net actuarial gain (loss)	(185)
Expected contribution to benefit plans in 2019	3,300
Postretirement Health Coverage [Member]
Benefit Plans (Textuals) [Abstract]
Defined Benefit Plan, Service Cost	19	29	22
Estimated net actuarial gain (loss)	121
Estimated prior service cost	369
Expected contribution to benefit plans in 2019	$ 130
401(k) [Member]
Benefit Plans (Textuals) [Abstract]
Percentage of defined contribution plan by plan participants	50.00%
Defined contribution plan cost	$ 6,551	6,677	2,535
KERP [Member]
Benefit Plans (Textuals) [Abstract]
Defined contribution plan cost	359	289	268
Adjustments for New Accounting Principle, Early Adoption [Member]
Benefit Plans (Textuals) [Abstract]
Defined Benefit Plan, Service Cost	143	155	113
Net other periodic post-employment costs	$ 245	$ 796	$ 981

Benefit plans.

No definition available.

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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.

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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.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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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.

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Amount of defined benefit plan cost (credit), classified as other.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit 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 (h)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of cost for defined contribution plan.

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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

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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