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Investments (Equity Method Investments Narrative) (Details)
6 Months Ended
Mar. 15, 2019
Sep. 30, 2018
Sep. 30, 2019
Pop      
Schedule of Equity Method Investments [Line Items]      
Ownership interest sold 50.00%    
Equity method investment, ownership percentage   50.00%  
Redeemable Preferred Stock | Pop      
Schedule of Equity Method Investments [Line Items]      
Rate of dividend on preferred stock   10.00%  
Minimum      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     12.00%
Maximum      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     49.00%