Restructuring and Lease Charges, Net (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 05, 2020	Dec. 29, 2019
Restructuring Cost and Reserve [Line Items]
Accrued restructuring and integration costs	$ 13,904	$ 13,880
Accrued expenses and other current liabilities	9,613	11,559
Restructuring Reserve, Accrual Adjustment	212
Restructuring and contract termination charges, net	6,804
Short-term accrued restructuring and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Accrued expenses and other current liabilities	9,600
Accrued expenses and other current liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Accrued expenses and other current liabilities		400
Long-term liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	2,500	800
Operating lease liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	1,300	$ 1,100
Operating lease right-of-use assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	$ 500