Accounting Policies (Earnings Per Share Reconciliation) (Details) - shares shares in Millions	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Accounting Policies [Abstract]
Shares excluded from the calculation of the effect of dilutive securities									0.4	0.4	0.6
Denominator for Basic Earnings Per Share	40.6	40.6	40.5	40.6	40.9	41.5	42.6	42.8	40.6	42.0	43.6
Effect of Dilutive Securities									0.2	0.2	0.3
Denominator for Diluted Earnings Per Share	40.9	40.8	40.7	40.8	41.1	41.7	43.0	43.1	40.8	42.2	43.9