Subsequent Events (Details)			12 Months Ended
	Mar. 03, 2022 $ / shares	Feb. 28, 2022 colleague	Jan. 01, 2022 $ / shares	Jan. 02, 2021 $ / shares	Dec. 28, 2019 $ / shares	Feb. 07, 2021 USD ($)
Subsequent Events
Additional number of shares authorized to repurchase | $						$ 20,000,000
Common share quarterly cash dividend declared (in dollars per share)			$ 1.09	$ 0.95	$ 0.83
Subsequent Events
Subsequent Events
Common share quarterly cash dividend declared (in dollars per share)	$ 0.31
Subsequent Events | Welch Consulting, Ltd.
Subsequent Events
Number of new colleagues | colleague		45