Bank Indebtedness and Long-Term Debt (Components of interest expense, net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Debt Disclosure [Abstract]
Interest expense	$ 32,862	$ 32,155	$ 29,771
Amortization of debt issuance costs	2,721	2,536	2,825
Interest income	(906)	(285)	(92)
Interest Expense, Total	$ 34,677	$ 34,406	$ 32,504