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Summary of Significant Accounting Policies - Amount of loss recognized in other comprehensive income, net of taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Notional amount | $ 1,000.0 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2.3 | $ 3.1 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (0.5) | (8.0) |
Accumulated other comprehensive Income loss Hedge | (0.9) | (2.7) | $ 2.2
Interest Rate Swap [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (27.6) | 3.5 | 0.0
Accumulated other comprehensive Income loss Hedge | (24.1) | 3.5 | $ 0.0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 0.0 | $ 0.0 |

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