Discontinuation of Business Unit, Sales of Assets and Business Units, and Goodwill (Details) - USD ($)		1 Months Ended	3 Months Ended									12 Months Ended
	Sep. 30, 2017	Apr. 30, 2016	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Oct. 01, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Discontinuation of Business Unit
Nonoperating expense												$ 401,919,000	$ 433,581,000	$ 453,753,000
Impairment of acquired intangible assets				$ 600,000	$ 11,900,000						$ 7,900,000	12,486,000	32,431,000	7,866,000
Restructuring charges			$ 11,854,000	$ 90,000	$ 4,376,000	$ 1,029,000	$ 2,483,000	$ 3,071,000	$ 1,576,000	$ 66,000		17,349,000	7,196,000	9,267,000
Sales of Assets and Business Units
Note receivable resulting from sale of assets and business units			$ 0				$ 3,050,000					0	3,050,000	0
Gain (loss) on sale of assets and business units												0	(1,496,000)	2,646,000
Proceeds from sale of assets and business units, net of cash sold												0	967,000	1,972,000
Goodwill [Abstract]
Goodwill impairment												0	0	0
Product
Discontinuation of Business Unit
Cost of product revenue												179,101,000	$ 164,657,000	$ 179,983,000
Millimeter Wave Business | Discontinued Operations
Discontinuation of Business Unit
Nonoperating expense												24,100,000
Impairment of acquired intangible assets												11,900,000
Restructuring charges												4,200,000
Millimeter Wave Business | Discontinued Operations | Product
Discontinuation of Business Unit
Cost of product revenue												$ 8,000,000
Hyderabad, India subsidiary and assets related to Simplay Labs testing and certification business | Disposed of by Sale
Sales of Assets and Business Units
Consideration of disposed group	$ 5,300,000							5,300,000
Cash received from sale of business unit	2,300,000
Note receivable resulting from sale of assets and business units	$ 3,000,000							3,000,000
Gain (loss) on sale of assets and business units								(1,800,000)
Goodwill [Abstract]
Disposal of goodwill								$ 2,200,000
Hyderabad | Disposed of by Sale
Sales of Assets and Business Units
Ownership percentage	100.00%							100.00%
Qterics | Disposed of by Sale
Sales of Assets and Business Units
Gain (loss) on sale of assets and business units		$ 2,600,000
Proceeds from sale of assets and business units, net of cash sold		$ 2,000,000							$ 300,000