Annual payments to Chairman of the Board, President and Chief Executive Officer until the trust is depleted.

No definition available.

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Composition of blended fund as described in percentage.

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No definition available.

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- Definition

The net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost and that are recognized as regulatory assets. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

No definition available.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6504226

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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- References

No definition available.

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No definition available.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6503904

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The increase in the fair value of plan assets from contributions made by the employer.

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No definition available.

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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- References

No definition available.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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-Paragraph 1
-Subparagraph (j)
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- References

No definition available.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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- References

No definition available.

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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.

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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

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

The total amount of the entity's obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans.

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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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Employee Benefit Plans (Details) - USD ($)	12 Months Ended
Employee Benefit Plans (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Change in Benefit Obligation [Abstract]
Benefit obligation at beginning of year	$ 31,572,000	$ 28,838,000	$ 26,383,000
Service cost		1,004,000	990,000	$ 1,023,000
Interest cost		1,157,000	1,056,000	1,038,000
Actuarial loss		1,517,000	1,219,000
Benefits paid		(944,000)	(810,000)
Benefit obligation at end of year		31,572,000	28,838,000	26,383,000
Change in Plan Assets [Abstract]
Actual return on plan assets		(802,000)	1,119,000
Employer contributions		500,000	1,000,000
Benefits paid		(944,000)	(810,000)
Fair value of plan assets at end of year		29,738,000	30,984,000	29,675,000
Recognized amounts [Abstract]
Plan assets at fair value		29,738,000	30,984,000	29,675,000	$ 29,738,000	$ 30,984,000	$ 29,675,000
Funded status					(1,834,000)	2,146,000
Net amount recognized as prepaid (accrued) benefit costs on the Consolidated Balance Sheets					(1,834,000)	2,146,000
Accumulated benefit obligation					$ 28,124,000	$ 25,012,000
Components of Net Periodic Benefit Cost [Abstract]
Service cost		1,004,000	990,000	1,023,000
Interest cost		1,157,000	1,056,000	1,038,000
Expected return on plan assets		(1,636,000)	(1,711,000)	(1,567,000)
Amortization of unrecognized net loss		373,000	244,000	342,000
Amortization of prior service cost		(86,000)	(86,000)	(86,000)
Net periodic benefit cost		$ 812,000	$ 493,000	$ 750,000
Weighted-Average % Assumptions Used to Determine Benefit Obligations [Abstract]
Discount rate (in hundredths)					3.50%	4.25%	4.25%
Rate of compensation increase (in hundredths)					4.00%	4.00%	4.00%
Weighted-Average % Assumptions Used to Determine Net Periodic Benefit Cost [Abstract]
Discount rate (in hundredths)		4.25%	4.25%	4.50%
Expected long-term return on plan assets		5.50%	6.00%	6.00%
Rate of compensation increase (in hundredths)		4.00%	4.00%	4.00%
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					100.00%	100.00%
Target Allocation		100.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 29,738,000	$ 30,984,000	$ 29,675,000	$ 29,738,000	$ 30,984,000	$ 29,675,000
Expected future service expected to be paid [Abstract]
2017					3,020,000
2018					1,556,000
2019					1,639,000
2020					1,244,000
2021					1,155,000
2022-2026					8,365,000
Employee Savings Plan [Abstract]
Defined contribution plan, cost recognized		379,000	359,000	$ 350,000
Items Not Yet Recognized as a Component of Net Periodic Benefit Costs [Abstract]
Amounts recognized as regulatory assets					18,881,126	14,917,823
Cash [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		807,000	1,072,000
Recognized amounts [Abstract]
Plan assets at fair value		$ 807,000	1,072,000		$ 807,000	$ 1,072,000
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					3.00%	3.00%
Target Allocation		3.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 807,000	1,072,000		$ 807,000	$ 1,072,000
Cash [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		807,000	1,072,000
Recognized amounts [Abstract]
Plan assets at fair value		807,000	1,072,000		807,000	1,072,000
Fair value of plan assets [Abstract]
Plan assets at fair value		807,000	1,072,000		807,000	1,072,000
U.S. Equity Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		14,398,000	14,602,000
Recognized amounts [Abstract]
Plan assets at fair value		$ 14,398,000	14,602,000		$ 14,398,000	$ 14,602,000
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					48.00%	47.00%
Target Allocation		54.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 14,398,000	14,602,000		$ 14,398,000	$ 14,602,000
Blended fund composition (in hundredths)					70.00%
U.S. Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		14,398,000	14,602,000
Recognized amounts [Abstract]
Plan assets at fair value		14,398,000	14,602,000		$ 14,398,000	14,602,000
Fair value of plan assets [Abstract]
Plan assets at fair value		14,398,000	14,602,000		14,398,000	14,602,000
Foreign Equity Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		2,993,000	3,690,000
Recognized amounts [Abstract]
Plan assets at fair value		$ 2,993,000	3,690,000		$ 2,993,000	$ 3,690,000
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					10.00%	12.00%
Target Allocation		21.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 2,993,000	3,690,000		$ 2,993,000	$ 3,690,000
Foreign Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		2,993,000	3,690,000
Recognized amounts [Abstract]
Plan assets at fair value		2,993,000	3,690,000		2,993,000	3,690,000
Fair value of plan assets [Abstract]
Plan assets at fair value		2,993,000	3,690,000		2,993,000	3,690,000
Total Equity Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		17,391,000	18,292,000
Recognized amounts [Abstract]
Plan assets at fair value		$ 17,391,000	18,292,000		$ 17,391,000	$ 18,292,000
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					58.00%	59.00%
Target Allocation		75.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 17,391,000	18,292,000		$ 17,391,000	$ 18,292,000
Total Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		17,391,000	18,292,000
Recognized amounts [Abstract]
Plan assets at fair value		17,391,000	18,292,000		17,391,000	18,292,000
Fair value of plan assets [Abstract]
Plan assets at fair value		17,391,000	18,292,000		17,391,000	18,292,000
US Treasury Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		387,000	524,000
Recognized amounts [Abstract]
Plan assets at fair value		387,000	524,000		387,000	524,000
Fair value of plan assets [Abstract]
Plan assets at fair value		387,000	524,000		387,000	524,000
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		387,000	524,000
Recognized amounts [Abstract]
Plan assets at fair value		387,000	524,000		387,000	524,000
Fair value of plan assets [Abstract]
Plan assets at fair value		387,000	524,000		387,000	524,000
High Yield Funds [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		4,397,000	3,284,000
Recognized amounts [Abstract]
Plan assets at fair value		4,397,000	3,284,000		4,397,000	3,284,000
Fair value of plan assets [Abstract]
Plan assets at fair value		4,397,000	3,284,000		4,397,000	3,284,000
High Yield Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		4,397,000	3,284,000
Recognized amounts [Abstract]
Plan assets at fair value		4,397,000	3,284,000		4,397,000	3,284,000
Fair value of plan assets [Abstract]
Plan assets at fair value		4,397,000	3,284,000		4,397,000	3,284,000
Foreign Bond Funds [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		624,000	1,857,000
Recognized amounts [Abstract]
Plan assets at fair value		624,000	1,857,000		624,000	1,857,000
Fair value of plan assets [Abstract]
Plan assets at fair value		624,000	1,857,000		624,000	1,857,000
Foreign Bond Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		624,000	1,857,000
Recognized amounts [Abstract]
Plan assets at fair value		624,000	1,857,000		624,000	1,857,000
Fair value of plan assets [Abstract]
Plan assets at fair value		624,000	1,857,000		624,000	1,857,000
US Corporate Bonds [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		990,000	902,000
Recognized amounts [Abstract]
Plan assets at fair value		990,000	902,000		990,000	902,000
Fair value of plan assets [Abstract]
Plan assets at fair value		990,000	902,000		990,000	902,000
US Corporate Bonds [Member] \| Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		990,000	902,000
Recognized amounts [Abstract]
Plan assets at fair value		990,000	902,000		990,000	902,000
Fair value of plan assets [Abstract]
Plan assets at fair value		990,000	902,000		990,000	902,000
Other Fixed Income Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		842,000	734,000
Recognized amounts [Abstract]
Plan assets at fair value		842,000	734,000		842,000	734,000
Fair value of plan assets [Abstract]
Plan assets at fair value		842,000	734,000		842,000	734,000
Other Fixed Income Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		842,000	734,000
Recognized amounts [Abstract]
Plan assets at fair value		842,000	734,000		842,000	734,000
Fair value of plan assets [Abstract]
Plan assets at fair value		842,000	734,000		842,000	734,000
Fixed Income Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		7,240,000	7,301,000
Recognized amounts [Abstract]
Plan assets at fair value		7,240,000	7,301,000		7,240,000	7,301,000
Fair value of plan assets [Abstract]
Plan assets at fair value		7,240,000	7,301,000		7,240,000	7,301,000
Fixed Income Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		5,408,000	5,665,000
Recognized amounts [Abstract]
Plan assets at fair value		5,408,000	5,665,000		5,408,000	5,665,000
Fair value of plan assets [Abstract]
Plan assets at fair value		5,408,000	5,665,000		5,408,000	5,665,000
Fixed Income Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		1,832,000	1,636,000
Recognized amounts [Abstract]
Plan assets at fair value		1,832,000	1,636,000		1,832,000	1,636,000
Fair value of plan assets [Abstract]
Plan assets at fair value		1,832,000	1,636,000		1,832,000	1,636,000
Fixed Income Securities [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		29,738,000	30,984,000
Recognized amounts [Abstract]
Plan assets at fair value		$ 29,738,000	30,984,000		$ 29,738,000	$ 30,984,000
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					25.00%	24.00%
Target Allocation		15.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 29,738,000	30,984,000		$ 29,738,000	$ 30,984,000
Fixed Income Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		27,906,000	29,348,000
Recognized amounts [Abstract]
Plan assets at fair value		27,906,000	29,348,000		27,906,000	29,348,000
Fair value of plan assets [Abstract]
Plan assets at fair value		27,906,000	29,348,000		27,906,000	29,348,000
Fixed Income Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		1,832,000	1,636,000
Recognized amounts [Abstract]
Plan assets at fair value		1,832,000	1,636,000		1,832,000	1,636,000
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 1,832,000	1,636,000		$ 1,832,000	$ 1,636,000
US Fixed Income Securities [Member]
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					22.00%	18.00%
Target Allocation		13.00%
U.S. Fixed Income Fund [Member]
Fair value of plan assets [Abstract]
Blended fund composition (in hundredths)					30.00%
Foreign Fixed Income Securities [Member]
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					3.00%	6.00%
Target Allocation		2.00%
Absolute Return Strategy Mutual Funds [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		$ 4,300,000	4,319,000
Recognized amounts [Abstract]
Plan assets at fair value		$ 4,300,000	4,319,000		$ 4,300,000	$ 4,319,000
Defined benefit plan, target and actual allocations [Abstract]
Actual Allocation					14.00%	14.00%
Target Allocation		7.00%
Fair value of plan assets [Abstract]
Plan assets at fair value		$ 4,300,000	4,319,000		$ 4,300,000	$ 4,319,000
Absolute Return Strategy Mutual Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Change in Plan Assets [Abstract]
Fair value of plan assets at end of year		4,300,000	4,319,000
Recognized amounts [Abstract]
Plan assets at fair value		4,300,000	4,319,000		4,300,000	4,319,000
Fair value of plan assets [Abstract]
Plan assets at fair value		4,300,000	$ 4,319,000		4,300,000	4,319,000
Subsequent Event [Member]
Change in Plan Assets [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	1,000,000
Fair value of plan assets [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 1,000,000
Accrued pension costs [Member]
Items Not Yet Recognized as a Component of Net Periodic Benefit Costs [Abstract]
Prior service cost					(144,000)	(230,000)
Net loss					10,972,000	7,391,000
Amounts recognized as regulatory assets					10,828,000	7,161,000
Supplemental Employee Retirement Plan [Member]
Fair value of plan assets [Abstract]
Employer discretionary contribution		$ 60,000
Employee Savings Plan [Abstract]
Annual payments from supplemental retirement agreement					100,000
Other Postretirement Benefits Payable					$ 1,034,000	$ 977,000