BENEFIT PLANS - Deferred Compensation Contracts (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Other comprehensive income for deferred compensation contracts	$ 58,000	$ 489,000	$ 988,000
Proceeds from company-owned life insurance policies	0	24,617,000	18,108,000
Former Vice Chairman
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Proceeds from company-owned life insurance policies	0	24,600,000	18,100,000
Gain on insurance proceeds	0	0	8,000,000.0
Former Vice Chairman \| General and Administrative Expense
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Projected benefit obligation	400,000	400,000	300,000
Deferred Compensation Contracts
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Projected benefit obligation	4,939,000	5,599,000
Deferred Compensation Contracts \| Key executives \| General and Administrative Expense
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense	0	0	$ 200,000
Deferred Compensation Contracts \| Former Vice Chairman
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense	2,400,000	2,400,000
Deferred Compensation Contracts \| Former Vice Chairman \| Accrued Liabilities
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Projected benefit obligation	$ 500,000	$ 500,000

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Amount of excess (deficiency) of insurance recovery over the loss incurred from an insured event.

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Amount of cash inflow for proceeds from settlement of corporate-owned life insurance policy, classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy.

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