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Investment In Films and Television Programs and Program Rights (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investment In Films And Television Programs and Program Rights [Abstract]        
Fair value film write-downs $ 0.1 $ 2.5 $ 1.6 $ 7.0