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Income Taxes - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Dec. 22, 2018	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Income Tax Disclosure [Abstract]
Income tax expense for the measurement period	$ 144.4
Income Tax Expense (Benefit)					$ 54.8
Change in enacted tax rate, amount				$ 37.4	14.0
Charges and benefit from valuation allowance, amount				21.7	52.5
Provisional remeasurement income tax expense discrete benefit, deferred tax balances	0.8		$ 21.7	$ (62.6)	$ 5.7
Estimated valuation allowance	$ 104.2
Effective income tax rate (percent)		(2.10%)	21.30%	4.30%	58.50%
Decrease in unrecognized tax benefits is reasonably possible		$ 16.3		$ 16.3

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of reasonable estimate for income tax expense for which accounting for tax effect from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated is incomplete pursuant to Tax Cuts and Jobs Act.

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