Restructuring and Lease Charges, Net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 05, 2020	Dec. 29, 2019
Restructuring Cost and Reserve [Line Items]
Accrued restructuring and integration costs	$ 15,123	$ 13,880
Accrued expenses and other current liabilities	11,298	11,559
Restructuring Reserve, Accrual Adjustment	212
Short-term accrued restructuring and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Accrued expenses and other current liabilities	11,300
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	1,700	800
Operating lease liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	$ 2,100	$ 1,100