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Investments (Cost Method Investments) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Jul. 31, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Value of shares issued to purchase cost method investment |  |  | $ 0.0 | $ 0.0 | $ 12.0
Telltale |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Cost method investments, amount invested | $ 40.0 |  |  |  |
Payments to acquire cost method investments | $ 28.0 |  |  |  |
Shares issued to purchase cost method investment (in shares) | 361,229 |  |  |  |
Value of shares issued to purchase cost method investment | $ 12.0 |  |  |  |
Cost method investments, ownership percentage |  |  | 14.00% |  |
Next Games |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Payments to acquire cost method investments |  | $ 2.0 |  |  |

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