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Summary of Significant Accounting Policies - Changes in accumulated balances of other comprehensive income (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 24, 2022 | Sep. 25, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $ (168.0) | $ (267.2) | $ (43.1)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | 0.3 | (0.3) | (1.3)
Accumulated Other Comprehensive Income (Loss), Net of Tax | (147.6) | (238.2) | (59.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent | 99.2 | (224.1) | (20.2)
Changes in pension plans, net of taxes of $0.3 in 2023, $0.4 in 2022, and $0.2 in 2021. | 0.6 | 1.0 | 0.5
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 90.6 | (179.1) |
Notional Amount | 377.9 |  |
Interest Rate Swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive Income loss Hedge | $ 20.1 | $ 29.3 | $ (14.7)

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