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Other Interests (Details) - USD ($)
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Noncontrolling Interest [Line Items]      
Accounts receivable service equity investment $ 500,000   $ 400,000
Holdings      
Noncontrolling Interest [Line Items]      
Ownership percentage 100.00%    
Equity method investment aggregate cost $ 2,000,000    
Holdings | Variable Interest Entity, Not Primary Beneficiary      
Noncontrolling Interest [Line Items]      
Equity method investment equity (28,800,000)   (28,900,000)
Equity method investment $ 0   $ 0
CONtv      
Noncontrolling Interest [Line Items]      
Ownership percentage 85.00%    
Management Service [Member]      
Noncontrolling Interest [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 300,000 $ 300,000