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Other Assets - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]          
Income (loss) from equity method investments $ (300,000) $ 200,000 $ (503,000) $ 6,153,000  
Marketable securities $ 0   $ 0   $ 3,023,000
Minimum          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 4.00%   4.00%    
Maximum          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 20.00%   20.00%