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Other Assets - Additional Information (Details) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]      
Income (loss) from equity method investments $ 5,965,000 $ 5,952,000 $ 0
Marketable securities $ 0 $ 3,023,000  
Minimum      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 4.00%    
Maximum      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 20.00%