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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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