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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 29, 2018 | Dec. 29, 2017 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017 | Sep. 29, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Measurement period adjustments on effective tax rate |  |  |  | 1 year |  |
Provisional remeasurement income tax expense discrete benefit, deferred tax balances |  |  |  | $ 14.0 |  |
Estimated valuation allowance |  | $ 52.5 |  | (52.5) |  |
Estimated ax on repatriation of foreign earnings |  |  |  | $ 13.1 |  |
Effective income tax rate (percent) | 22.20% |  | 30.40% | 42.70% | 29.20% |
Discrete tax benefit | $ 3.6 |  |  | $ 60.1 |  |
Nonrecurring benefit | 2.8 |  |  |  |  |
Federal hurricane credit | 5.7 |  |  |  |  |
Decrease in unrecognized tax benefits | $ 7.2 |  |  | $ 7.2 |  |
Scenario, Forecast |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Federal statutory tax rate, percent |  |  |  |  |  | 24.60%

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