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BENEFIT PLANS - Deferred Compensation Contracts (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
empoyee
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Compensation expense (benefit)     $ 514 $ 402 $ 1,195
Tax-effected accumulated other comprehensive loss for deferred compensation contracts     652 495 657
Proceeds from company-owned life insurance policies     876 2,948 0
Deferred Compensation Contracts          
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Total current and noncurrent portion     6,821 7,251  
Proceeds from life insurance policy, umber of former employees | empoyee   2      
Proceeds from company-owned life insurance policies $ 900 $ 2,900      
Deferred Compensation Contracts | General and Administrative Expense          
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Gain on insurance proceeds $ 100 $ 1,200      
Deferred Compensation Contracts | Key executives          
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Compensation expense (benefit)     200 200 400
Deferred Compensation Contracts | Former Vice Chairman          
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Compensation expense (benefit)     300 200 $ 800
Total current and noncurrent portion     2,800 3,000  
Deferred Compensation Contracts | Former Vice Chairman | Accrued Liabilities          
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Total current and noncurrent portion     $ 500 $ 500