Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020	Jan. 01, 2021
Income Tax Contingency [Line Items]
Effective income tax rate	14.50%	30.50%	15.40%	26.50%
Other noncurrent liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 48.1		$ 48.1		$ 47.8
Unrecognized tax benefit liabilities include interest and penalties	$ 10.6		$ 10.6		$ 9.6