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Acquisition Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 25, 2018
Sep. 24, 2017
Sep. 25, 2016
Mar. 25, 2018
Mar. 26, 2017
Jun. 26, 2016
Mar. 06, 2018
Jun. 25, 2017
Purchase Price Allocation [Line Items]                
Business Acquisition, Goodwill, Expected Tax Deductible Amount             $ 246,000  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 4,191              
Business Acquisition, Transaction Costs $ 3,100     $ 3,100        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory             24,931  
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 $ 427,000              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   $ 1,900 $ 2,800 1,850 $ 2,775      
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             10,504  
Goodwill, Acquired During Period 246,278              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets             430,713  
Finite-Lived Intangible Assets, Gross             149,000  
Goodwill 617,651     $ 617,651       $ 618,828
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             (3,264)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities             (290)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities             (3,593)  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net             427,120  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual $ (2,325)              
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