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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
May 29, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Redeemable Noncontrolling Interest [Line Items] |  |  |
Initial fair value of redeemable noncontrolling interest of 3 Arts Entertainment |  | $ 15.8 | $ 0.0
3 Arts Entertainment |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Initial fair value of redeemable noncontrolling interest of 3 Arts Entertainment | $ 15.8 |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders | 49.00% |  |
Put option, term from acquisition date |  | 5 years |
Put rights exercise period |  | 60 days |
Period after expiration of put rights that cal rights begin |  | 30 days |
Call rights exercise period |  | 60 days |

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- Details
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