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Summary of Significant Accounting Policies - Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 25, 2020 | Oct. 27, 2019 | Oct. 28, 2018
Rabbi trust |  |  |
Investments |  |  |
Gains (losses) related to securities held | $ 7.0 | $ 8.3 | $ (0.4)

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