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Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Earnings Per Share [Abstract]        
Weighted-average common shares outstanding 57.8 58.1 57.9 58.1
Effect of dilutive securities 1.2 1.3 1.3 1.3
Weighted-average common shares outstanding, assuming dilution 59.0 59.4 59.2 59.4