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Effect of New Accounting Pronouncements (Details) $ in Millions | 12 Months Ended
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Oct. 31, 2018 USD ($)
Retained Earnings | Accounting Standards Update 2016-16 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Expected decrease in retained earnings as result of adoption of ASU 2016-16 | $ 129.8

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