Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Net sales		$ 636,322	$ 812,775	$ 887,214
Cost and expenses:
Cost of sales (1)	[1]	333,454	429,449	500,253
Research and development		88,571	92,589	91,963
Selling, general and administrative		132,249	131,390	126,958
Amortization of cost		36,355	33,185	35,414
Gain on sale of PCB Test business (2)	[2]	0	0	(70,815)
Restructuring charges (Note 4)		2,421	605	1,823
Impairment charges		0	0	100
Costs and Expenses		593,050	687,218	685,696
Income from operations		43,272	125,557	201,518
Other (expense) income:
Interest expense		(3,382)	(4,177)	(6,413)
Interest income		11,504	4,012	239
Foreign transaction gain (loss)		(5,209)	1,635	411
Loss on extinguishment of debt		(369)	(312)	(3,411)
Total		45,816	126,715	192,344
Income tax provision		17,660	29,868	25,019
Net income		$ 28,156	$ 96,847	$ 167,325
Basic: (in dollars per share)		$ 0.59	$ 2.01	$ 3.53
Diluted: (in dollars per share)		$ 0.59	$ 1.98	$ 3.45
Weighted average shares used in computing income per share:
Basic (in shares)		47,486	48,178	47,409
Diluted (in shares)		48,025	48,799	48,460

[1] Excludes amortization of $28,418, $26,023, and $27,508 for the years ended December 30, 2023, December 31, 2022, and December 25, 2021, respectively.

[2] On June 24, 2021 we completed the divestment of our PCB Test business. The divestment of this business did not qualify for presentation as discontinued operations and the results of the PCB Test business are included in continuing operations for all periods presented. See Note 14, “Business Divestitures and Discontinued Operations” for additional information on this transaction and financial statement presentation.