BENEFIT PLANS - Deferred Compensation Contracts (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Other comprehensive income for deferred compensation contracts	$ 988	$ 652	$ 495
Compensation expense (benefit)	578	514	402
Proceeds from company-owned life insurance policies	18,108	876	2,948
Deferred Compensation Contracts
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total current and noncurrent portion	6,302	6,821
Deferred Compensation Contracts \| General and Administrative Expense
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Gain on insurance proceeds	8,000	100	1,200
Deferred Compensation Contracts \| Key executives
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense (benefit)	200	200	200
Deferred Compensation Contracts \| Former Vice Chairman
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense (benefit)	300	300	$ 200
Total current and noncurrent portion	2,600	2,800
Deferred Compensation Contracts \| Former Vice Chairman \| Accrued Liabilities
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total current and noncurrent portion	$ 500	$ 500

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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