BENEFIT PLANS - Deferred Compensation Contracts (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2016	Oct. 31, 2013	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense (benefit)			$ 402	$ 1,195	$ 1,641
Tax-effected accumulated other comprehensive loss for deferred compensation contracts			495	657	287
Proceeds from company-owned life insurance policies			2,948	0	0
Deferred Compensation Contracts
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Proceeds from company-owned life insurance policies	$ 2,900
Total current and noncurrent portion			7,251	8,698
Deferred Compensation Contracts | General and Administrative Expense
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Gain on insurance proceeds	$ 1,200
Deferred Compensation Contracts | Key executives
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense (benefit)			200	400	900
Deferred Compensation Contracts | Former Vice Chairman
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation expense (benefit)			200	800	$ (2,100)
Proceeds from company-owned life insurance policies		$ 5,800
Total current and noncurrent portion			3,000	3,300
Deferred Compensation Contracts | Former Vice Chairman | Accrued Liabilities
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total current and noncurrent portion			$ 500	$ 500
Deferred Compensation Contracts | Former Vice Chairman | General and Administrative Expense
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Gain on insurance proceeds		$ 1,000