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Description of Business, Basis of Presentation and Significant Accounting Policies (Investment in Films and Television Programs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Capitalized interest for films and television programs produced | $ 7.9 | $ 8.7 | $ 19.9
Ultimate revenue, estimates used, maximum term, motion picture | 10 years |  |
Ultimate revenue, estimates used, maximum term, television series | 10 years |  |
Ultimate revenue, estimates used, term, television series still in production | 5 years |  |
Ultimate revenue, estimates used, maximum term, acquired libraries | 20 years |  |
Projects in development, potential trigger for write-off of development costs, time period from date of initial investment | 3 years |  |
Film and television program impairment charges | $ 36.3 | $ 22.7 |

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- Definition Maximum period over which ultimate revenues are estimated following the date of acquisition for titles included in acquired libraries. + References No definition available. + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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