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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 29, 2018	Dec. 29, 2017	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017	Sep. 29, 2018
Income Tax Contingency [Line Items]
Measurement period adjustments on effective tax rate				1 year
Provisional remeasurement income tax expense discrete benefit, deferred tax balances				$ 14.0
Estimated valuation allowance		$ 52.5		(52.5)
Estimated ax on repatriation of foreign earnings				$ 13.1
Effective income tax rate (percent)	22.20%		30.40%	42.70%	29.20%
Discrete tax benefit	$ 3.6			$ 60.1
Nonrecurring benefit	2.8
Federal hurricane credit	5.7
Decrease in unrecognized tax benefits	$ 7.2			$ 7.2
Scenario, Forecast
Income Tax Contingency [Line Items]
Federal statutory tax rate, percent						24.60%

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