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Stockholders' Equity - Stock Repurchase Plan (Details) - USD ($) | 6 Months Ended | 33 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Nov. 09, 2017 | Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares repurchased (in shares) | 0 |  |  |
2015 Stock Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum stock repurchase amount approved by Board of Directors |  |  |  | $ 200,000,000
Shares purchased since inception (in shares) |  | 2,020,000,000 |  |
Repurchased stock value |  | $ 135,000,000 |  |
Repurchased stock acquired average cost per share |  | $ 66.69 |  |
Remaining authorized repurchase amount | $ 65,000,000 | $ 65,000,000 |  |
Subsequent Event | 2017 Stock Repurchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum stock repurchase amount approved by Board of Directors |  |  | $ 335,000,000 |
Subsequent Event | 2015 And 2017 Stock Repurchase Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining authorized repurchase amount |  |  | $ 400,000,000 |

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