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Summary of Significant Accounting Policies - Changes in accumulated balances of other comprehensive income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $ (43.1) | $ (22.9) | $ (41.4)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (1.3) | (1.8) | (1.7)
Accumulated other comprehensive Income loss Hedge | 0.0 | (0.9) | (2.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax | (59.1) | (49.7) | (42.3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent | (20.2) | 18.5 | (14.8)
Changes in pension plans, net of taxes of $0.2 in 2021, $0.1 in 2020, and $0.3 in 2019 | 0.5 | (0.1) | (0.6)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (9.9) | (9.7) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.5 | 2.3 |
Notional Amount | 861.5 |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 0.0 |
Pension in Accumulated Other Comprehensive Income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 0.0 |
Interest Rate Swap [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive Income loss Hedge | (14.7) | (24.1) | $ 3.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | 0.0 |
Interest rate caps - derivative |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 0.5 | $ 2.3 |

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