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Summary of Significant Accounting Policies Reclassification (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018
Reclassifications [Abstract] |  |  |
Store Occupancy Cost | $ 2,388.0 | $ 2,411.2 | $ 2,250.5

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- Definition Reclassifications [Abstract] + References No definition available. + Details
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- Definition costs specifically related to store occupancy + References No definition available. + Details
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