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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2019 | Dec. 29, 2018 | Mar. 31, 2018 | Mar. 30, 2019 | Mar. 31, 2018 | Sep. 29, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Other Tax Expense (Benefit) |  | $ 19.2 | $ 327.0 |  |  |  |
Company's effective tax rate | 22.90% |  | 1.40% | 30.20% | 53.80% |  |
Blended statutory income tax rate | 21.00% |  |  |  |  |  | 35.00%
Final Net Tax Benefit amount for Tax Cuts and Job Act |  | $ 341.2 |  |  |  | $ 346.2 |
Provisional tax benefit of tax reform that relates to deferred taxes |  |  |  |  |  | $ 346.4 |
Benefit Reduction for Tax Cuts and Jobs Act | $ 5.0 |  |  |  |  |  |
Increase to income tax expense adoption of ASU 2016-16 |  |  |  | $ 29.5 |  |  |
Decrease in deferred tax liabilities due to ASC 2016-16 |  |  |  | 48.7 |  |  |
Increase to Net Income resulted from adoption of ASU 2016-16 |  |  |  | 19.2 |  |  |
Increase to Earnings per Share resulted from adoption of ASC 2016-16 | $ 0.0 |  |  |  |  |  |
Increase in deferred tax assets resulting from adoption of ASCU 2016-16 |  |  |  | 2.9 |  |  |
Decease in accumulated deficit resulting from adoption of ASCU 2016-16 |  |  |  | 2.5 |  |  |
Decease to prepaid taxes resulting from adoption of ASCU 2016-16 |  |  |  | $ 0.4 |  |  |

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