Acquisition Acquisition (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 24, 2018	Mar. 25, 2018	Dec. 24, 2017	Sep. 25, 2016	Dec. 30, 2018	Dec. 24, 2017	Jun. 24, 2018	Mar. 06, 2018	Jun. 25, 2017
Purchase Price Allocation [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		13 years 9 months 16 days
Business Acquisition, Goodwill, Expected Tax Deductible Amount								$ 245,000
Business Acquisition, Transaction Costs					$ 134
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory								22,500
Business Acquisition, Date of Acquisition Agreement		Mar. 06, 2018
Business Acquisition, Name of Acquired Entity		Infineon Technologies AG (Infineon) Radio Frequency Power Business (RF Power)
Business Combination, Consideration Transferred	$ 2,000	$ 427,000					$ 429,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 1,900	$ 2,800	0	$ 1,850
Cash consideration paid to shareholders				$ 13,800
Business Combination, Contingent Consideration, Liability									$ 4,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment								11,722
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other								433
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets								432,612
Finite-Lived Intangible Assets, Gross								149,000
Goodwill	$ 620,330				$ 620,330		$ 620,330
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable								(39)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities								(3,411)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities								(3,450)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net								429,162
Developed technology
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Assets, Gross								44,000
Finite-Lived Intangible Asset, Useful Life		14 years
Customer relationships
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Assets, Gross								92,000
Finite-Lived Intangible Asset, Useful Life		15 years
Leases, Acquired-in-Place, Market Adjustment [Member]
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Assets, Gross								1,000
Leases, Acquired-in-Place [Member]
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Non-compete agreements
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Assets, Gross								$ 12,000
Finite-Lived Intangible Asset, Useful Life		4 years