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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 22, 2018 | Mar. 29, 2019 | Mar. 30, 2018 | Mar. 29, 2019 | Mar. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense for the measurement period | $ 144.4 |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 69.4
Change in enacted tax rate, amount |  |  |  |  | 16.9
Charges and benefit from valuation allowance, amount |  |  |  |  | $ 52.5
Provisional remeasurement income tax expense discrete benefit, deferred tax balances | 14.3 | $ 37.4 | $ 40.6 |  |
Estimated valuation allowance | $ 104.2 |  |  |  |
Effective income tax rate (percent) |  | (7.10%) | 106.60% | 7.30% | 188.50%
Decrease in unrecognized tax benefits is reasonably possible |  | $ 21.2 |  | $ 21.2 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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