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Summary of Significant Accounting Policies - Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 28, 2018 | Oct. 29, 2017 | Oct. 30, 2016
Rabbi trust |  |  |
Investments |  |  |
Gains related to securities held | $ (0.4) | $ 6.2 | $ 2.6

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