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Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]          
Income tax expense $ 1.0   $ 0.9 $ 4.0 $ 1.0
Pretax income (loss) from continuing operations $ 9.5   $ 2.5 $ 29.3 $ (12.1)
Effective income tax rates 10.50%   36.00% 13.70% (8.30%)
Remeasurement of deferred tax liabilities net   $ 32.2      
Benefit due to reclassification of alternative minimum tax credit carryforward   $ 1.3