Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Earnings Per Share [Abstract]
Weighted-average common shares outstanding (in shares)	54.4	55.2	54.5	55.4
Effect of dilutive securities (in shares)	0.4	0.8	0.4	0.8
Weighted-average common shares outstanding, diluted (in shares)	54.8	56.0	54.9	56.2