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Segment Information - Income by Segment and Reconciliation to Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jul. 28, 2019	Jul. 26, 2020	Jul. 28, 2019
Segment Reporting Information [Line Items]
Operating income (loss)	$ 18,756	$ 11,769	$ 34,524	$ 23,936
Items to reconcile segment operating income to consolidated income before taxes:
Share-based compensation	13,186	12,425	22,565	24,403
Intangible amortization	2,020	3,908	4,860	9,051
Investment impairments and credit loss reserves	1,485	0	5,115	0
Changes in the fair value of contingent earn-out obligations	0	0	(33)	(2,161)
Interest expense	1,252	2,597	2,811	5,064
Non-operating expense (income), net	176	(1,213)	(247)	(2,256)
Income before taxes and equity in net (losses) gains of equity method investments	15,843	10,385	26,845	21,128
Corporate, Non-Segment
Items to reconcile segment operating income to consolidated income before taxes:
Share-based compensation	13,186	12,425	22,565	24,403
Intangible amortization	2,020	3,908	4,860	9,051
Investment impairments and credit loss reserves	1,485	0	5,115	0
Changes in the fair value of contingent earn-out obligations	0	0	(33)	(2,161)
Restructuring and other reserves	502	2,571	502	2,711
Litigation cost, net of recoveries	105	799	251	725
Transaction and integration related	249	33	247	1,468
Interest expense	1,252	2,597	2,811	5,064
Non-operating expense (income), net	176	(1,213)	(247)	(2,256)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	34,818	31,505	62,916	60,133
Semiconductor Products Group
Segment Reporting Information [Line Items]
Operating income (loss)	$ 34,818	$ 31,505	$ 62,916	$ 60,133

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