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Goodwill and other intangible assets (Tables)

12 Months Ended

Jan. 02, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Other intangible assets



	January 2, 2016												December 27, 2014
	Cost				Accumulated Amortization				Net				Cost				Accumulated Amortization				Impairment Loss				Net
	(In thousands)
Completed technology	$	26,900			$	11,236			$	15,664			$	30,600			$	9,691			$	1,788			$	19,121
Research contracts	—				—				—				100				100				—				—
Tradename	100				100				—				800				775				—				25
Total	$	27,000			$	11,336			$	15,664			$	31,500			$	10,566			$	1,788			$	19,146

Estimated future amortization expense related to current intangible assets



	(In thousands)
2016	$	3,457
2017	3,457
2018	3,457
2019	2,818
2020	900
Total	$	14,089