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SIGNIFICANT ACCOUNTING POLICIES - Deferred Compensation Plan Assets and Related Liabilities (Narrative) (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]      
Deferred compensation plan assets, current $ 3,600 $ 5,700  
Deferred compensation plan assets, total 44,577 41,518  
Deferred compensation plan income (expense) (3,960) (4,020) $ 1,605
Other Income (Expense), Net      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Unrealized gains (losses) on plan assets 4,000 4,000 (1,600)
Selling, General and Administrative Expenses      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred compensation plan income (expense) $ (4,000) $ (4,000) $ 1,600