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Stockholders' Equity - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Jul. 31, 2020 | Apr. 30, 2020 | Jul. 31, 2019 | Jan. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Number of shares (in shares) | 0 |  | 0 |  | 160,850 | 24,500
Average repurchase price per share (in dollars per share) |  |  |  |  | $ 296.9 | $ 248.7
Total costs of shares repurchased (in millions) |  | $ 47.8 |  | $ 6.1 | $ 47.8 | $ 6.1

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