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Significant Accounting Policies (Investment in Films and Television Programs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Significant Accounting Policies [Abstract] |  |  |
Capitalized interest for films and television programs produced | $ 8.7 | $ 19.9 | $ 15.6
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 | $ 22.7 | $ 25.0 |

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- Definition Significant Accounting Policies [Abstract] + References No definition available. + Details
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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 For an episodic television series still in production, period over which ultimate revenues are estimated following the date of delivery of the most recent episode, if later than ten years following the date of delivery of the first episode. + 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 -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: 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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