Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Net sales		$ 887,214	$ 636,007	$ 583,329
Cost and expenses:
Cost of sales (1)	[1]	500,253	364,225	353,500
Research and development		91,963	86,151	86,147
Selling, general and administrative		126,958	129,248	142,936
Amortization of purchased intangible assets		35,414	38,746	39,590
Gain on sale of PCB Test business (2)	[2]	(70,815)	0	0
Restructuring charges (Note 4)		1,823	7,623	13,484
Impairment charges		100	11,249	0
Gain on sale of facilities		0	(4,495)	0
Costs and Expenses, Total		685,696	632,747	635,657
Income (loss) from operations		201,518	3,260	(52,328)
Other (expense) income:
Interest expense		(6,413)	(13,759)	(20,556)
Interest income		239	224	764
Foreign transaction gain (loss)		411	(3,170)	43
Gain (loss) on extinguishment of debt		(3,411)	268	0
Total		192,344	(13,177)	(72,077)
Income tax provision (benefit)		25,019	666	(3,082)
Income (loss) from continuing operations		167,325	(13,843)	(68,995)
Income (loss) from discontinued operations, net of tax		0	42	(697)
Net income (loss)		167,325	(13,801)	(69,692)
Net income from noncontrolling interest		0	0	8
Net income (loss) attributable to Cohu		$ 167,325	$ (13,801)	$ (69,700)
Basic:
Income (loss) from continuing operations (in dollars per share)		$ 3.53	$ (0.33)	$ (1.68)
Income (loss) from discontinued operations (in dollars per share)		0	0.00	(0.01)
Net income attributable to noncontrolling interest (in dollars per share)		0	0	0.00
Net income (loss) attributable to Cohu (in dollars per share)		3.53	(0.33)	(1.69)
Diluted:
Income (loss) from continuing operations (in dollars per share)		3.45	(0.33)	(1.68)
Income (loss) from discontinued operations (in dollars per share)		0	0.00	(0.01)
Net income attributable to noncontrolling interest (in dollars per share)		0	0	0.00
Net income (loss) attributable to Cohu (in dollars per share)		$ 3.45	$ (0.33)	$ (1.69)
Weighted average shares used in computing income (loss) per share:
Basic (in shares)		47,409	41,854	41,159
Diluted (in shares)		48,460	41,854	41,159

[1] Excludes amortization of $27,508, $29,510, and $30,126 for the years ended December 25, 2021, December 26, 2020, and December 28, 2019, 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.