Financial Instruments and Fair Value Measurements (Impact of Cash Flow Hedges on Other Comprehensive Income, AOCI and the Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Interest expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI	$ (1,066)	$ 444	$ (2,431)	$ 1,847
Interest expense | Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	(11)	(991)	(7,401)	(6,590)
Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI	590	(500)	549	(1,294)
Sales | Foreign exchange forwards
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	68	(400)	277	(1,099)
Cost of sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI	(651)	309	(1,059)	1,137
Cost of sales | Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	451	(68)	(2,277)	1,661
Operating expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI	(23)	0	(57)	0
Operating expenses | Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	$ 57	$ 0	$ (15)	$ 0