Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2018	Dec. 30, 2017	Apr. 01, 2017	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 0.9		$ 1.7
Pretax income (loss) from continuing operations	$ 5.5		$ (8.5)
Effective income tax rates	16.40%		(20.00%)
Federal statutory income tax rate	21.00%			35.00%
Tax benefit due to reclassification deferred tax assets and liabilities		$ 32.2
Tax benefit due to reclassification corporate alternative minimum tax		$ 1.3