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Income Taxes (Income Tax Benefits Realized from the Exercise of Nonqualified Stock Options, and Disqualifying Dispositions of Stock Sold Under our Employee Stock Purchase Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax benefits realized under stock plans | $ 7.9 | $ 2.2 | $ 1.8

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