Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Operating activities
Net earnings	$ 103,950	$ 71,643
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	40,650	42,146
(Gain) loss on disposal of property and equipment	(59)	(177)
Inventory write-offs for obsolescence	5,825	4,784
Deferred income taxes	2,347	901
Other	8,816	5,728
Net change in operating assets and liabilities	(127,944)	(67,703)
Net cash provided by operating activities	33,585	57,322
Investing activities
Capital expenditures	(35,909)	(28,527)
Proceeds from sale of property and equipment	72	200
Purchase of short-term investments	(7,753)	(12,853)
Maturity of short-term investments	56,674	29,519
Other investing activities	(199)	347
Net cash provided by (used in) investing activities	12,885	(11,314)
Financing activities
Repurchase of convertible debt instruments	0	(300)
Repurchase of common stock held in treasury	(9,873)	0
Cash withholding taxes paid when shares withheld for vested equity awards	(2,123)	(1,963)
Net cash provided by (used in) financing activities	(26,465)	(16,020)
Effect of exchange rate changes on cash and cash equivalents	(4,865)	(6,015)
Net increase (decrease) in cash and cash equivalents	15,140	23,973
Cash and cash equivalents at beginning of period	774,108	619,874
Cash and cash equivalents at end of period	789,248	643,847
Common Stock [Member]
Operating activities
Net earnings	0	0
Financing activities
Dividends paid to common stockholders	(13,259)	(12,608)
Class B Convertible Common Stock [Member]
Operating activities
Net earnings	0	0
Financing activities
Dividends paid to common stockholders	$ (1,210)	$ (1,149)