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Related Party Transactions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | May 21, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Common shares agreed to be purchased (in shares) | 5,000,000 |  |  |  |
Common shares, no par value | $ 0 |  |  |  |
Related party expenses incurred |  |  |  | $ 0.8 |
Investment in equity method investees |  | $ 53.4 | $ 20.6 | 16.8 |
Director |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party, ownership percentage of entity |  | 100.00% |  |  |
Related party transaction, amounts paid |  | $ 0.1 | 0.0 |  |
Equity Method Investees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party expenses incurred |  | 22.0 | 10.5 | 12.3 |
Atom Tickets | Equity Method Investees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment in equity method investees |  | $ 10.0 | $ 0.0 | 7.9 |
Class A Voting Common Shares |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common shares, no par value |  | $ 0 | $ 0 |  |
Class A Voting Common Shares | Subsequent Event | Chairman of the Board of Directors |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of common stock outstanding held by Mark H. Rachesky |  |  |  |  | 18.50%
Class B Non-Voting Common Shares |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common shares, no par value |  | $ 0 | $ 0 |  |
Class B Non-Voting Common Shares | Subsequent Event | Chairman of the Board of Directors |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of common stock outstanding held by Mark H. Rachesky |  |  |  |  | 11.70%
Voting Agreement | Chairman of the Board of Directors |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Maximum out-of-pocket expenses reimbursable |  |  | $ 1.6 |  |
Related party expenses incurred |  |  | 0.5 |  |
Voting Agreement | Director |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Maximum out-of-pocket expenses reimbursable |  |  | 1.6 |  |
Related party expenses incurred |  |  | 1.5 |  |
Other | Director |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party expenses incurred |  | $ 5.6 | $ 1.0 |  |
Maximum | Director |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amounts paid |  |  |  | $ 0.1 |

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