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SIGNIFICANT ACCOUNTING POLICIES - Advertising Costs (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Selling, General and Administrative Expenses      
Property, Plant and Equipment [Line Items]      
Advertising costs $ 3.8 $ 3.3 $ 2.2