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Stockholders' Equity (Share Repurchases) (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Oct. 31, 2017 | Mar. 31, 2017
Equity [Abstract] |  |  |
Share Repurchase Program, increase amount |  |  | $ 500,000,000
Share Repurchase Program, maximum amount authorized |  |  | $ 1,000,000,000.0
Number of common stock repurchased, shares | 0 | 258,000 |
Common stock repurchased, value |  | $ 55,000,000 |
Share Repurchase Program, remaining authorized amount | $ 563,500,000 |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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