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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% |

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