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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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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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