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Stockholder's Equity (Share Based Compensation) (Details) - USD ($) $ in Millions | 3 Months Ended
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Jan. 01, 2021 | Dec. 27, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Document Period End Date | Jan. 01, 2021 |
Share-based compensation expense | $ 44.5 | $ 33.6
Cost of sales [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Share-based compensation expense | 6.4 | 4.2
Research and development [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Share-based compensation expense | 20.3 | 14.8
Selling, general and administrative [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Share-based compensation expense | $ 17.8 | $ 14.6

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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