v3.8.0.1

Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Billions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 22, 2018 | Feb. 21, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Oct. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Cash dividends declared per share, quarterly (in dollars per share) | $ 0.1125 | $ 0.075 | $ 0.1125 | $ 0.065 | $ 0.2625 | $ 0.195 |
Share Repurchase program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common stock retired (in shares) |  |  |  |  | 102.0 |  | 1.7
Open share repurchases during period (in shares) |  |  |  |  | 1.4 |  |
Repurchases of common stock recorded as a reduction to stockholders' equity |  |  |  |  | $ 1.7 |  |
Share repurchase program additional authorized amount |  | $ 2.5 |  |  |  |  |
Remaining authorized repurchase amount |  |  | $ 6.6 |  | $ 6.6 |  |

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