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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. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 11.0	$ 1.3	$ 3.1
Notional amount	1,000.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3.1	4.0
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	2.2	6.6	$ 3.6
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(8.0)	(5.7)
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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Nominal or face amount used to calculate payments on the derivative liability.

+ References

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