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Investment In Films and Television Programs and Program Rights (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Investment In Films And Television Programs and Program Rights [Abstract] |  |  |  |
Fair value film write-downs | $ 2.5 | $ 2.3 | $ 7.0 | $ 2.6

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