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ACCOUNTING POLICIES - Goodwill and Intangible Assets (Details) - USD ($)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]      
Goodwill, impairment loss $ 0 $ 0 $ 0
Indefinite-lived intangible assets $ 0 $ 0  
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 3 years    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 18 years