Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Sep. 30, 2018	Oct. 01, 2018	Jan. 31, 2018
Income Tax Examination [Line Items]
Company's effective tax rate	(324.50%)	25.50%
Income tax benefit for remeasurements of deferred tax deferred tax liability as result of change in tax rate	$ 355.2
Charge for transition taxes related to the deemed repatriation of foreign earnings	26.0
Estimated net benefit effect of existing deferred tax balances and transition tax due to change in tax rate	329.2
Provisional net benefit amount recorded for remeasurements of deferred tax balance due to change in rate	355.2
State and Local Jurisdiction [Member] | Selling, General and Administrative Expenses [Member]
Income Tax Examination [Line Items]
Reversal of selling and administrative expense due to settlement of state tax audit	$ 4.0
Subsequent Event Type [Member] | State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Settlement liability of state tax audit					$ 11.0
Scenario, Forecast [Member]
Income Tax Examination [Line Items]
Blended statutory income tax rate			24.50%
Projected tax rate at which deferred tax assets and liabilities positions will reverse			24.50%	21.00%