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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 |
--- | --- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
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 | 0.5 | $ 2.3 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 0.4 | (0.5) |
Accumulated other comprehensive Income loss Hedge | 0.0 | (0.9) | $ (2.7)
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 | 9.4 | (27.6) |
Accumulated other comprehensive Income loss Hedge | (14.7) | (24.1) | $ 3.5
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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