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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 29, 2019 | Jun. 30, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |  |
U.S. federal corporate tax rate |  |  | 21.00% | 35.00% |  | 28.17%
Provisional tax expense |  |  |  |  |  | $ 41.4
One-time transition tax expense |  |  |  |  |  | 44.1
Benefit from remeasurement of deferred tax at new tax rate |  |  |  |  |  | 2.7
One-time transition tax effect net on income tax payable |  |  | $ 11.9 |  |  |
Non-discrete tax expense |  |  | 1.4 |  |  |
Discrete tax benefit |  |  | (0.2) |  |  |
Provision for income taxes | $ 7.5 | $ 53.3 | 7.2 | $ 56.5 |  |
Gross unrecognized tax benefits | 24.7 |  | 24.7 |  |  | 24.8
Gross unrecognized tax benefits increased (decreased) during the year |  |  | (0.1) |  |  |
Interest and penalties accrued related to unrecognized tax benefits | 2.3 |  | 2.3 |  |  |
Increase in interest and penalties accrued related to unrecognized tax benefits |  |  |  |  |  | $ 0.4
Maximum [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Estimated increase in unrecognized tax benefit in next twelve months | $ 4.4 |  | $ 4.4 |  |  |
Cash Assets [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
One-time transition tax rate on post-1986 foreign earnings and profits | 15.50% |  | 15.50% |  |  |
Other Specified Assets [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
One-time transition tax rate on post-1986 foreign earnings and profits | 8.00% |  | 8.00% |  |  |
Scenario, Plan [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
U.S. federal corporate tax rate |  |  |  |  | 21.00% |

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