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Acquisitions - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 04, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Apr. 01, 2018
USD ($)
May 29, 2018
USD ($)
Business Acquisition [Line Items]          
Impairment charges related to IPR&D projects       $ 2,000,000  
Senior Notes | Term B Loan          
Business Acquisition [Line Items]          
Principal amount of debt $ 200,000,000       $ 198,000,000.0
GigPeak, Inc.          
Business Acquisition [Line Items]          
Total purchase price 250,117,000        
GigPeak, Inc. | In-process research and development (IPR&D)          
Business Acquisition [Line Items]          
Estimated remaining costs to complete the contract 7,500,000        
Estimated fair value of intangible assets acquired $ 10,200,000        
Intangible assets reaching technological feasibility   $ 1,200,000 $ 3,100,000 $ 1,200,000  
GigPeak, Inc. | In-process research and development (IPR&D) | Measurement Input, Discount Rate          
Business Acquisition [Line Items]          
Contingent consideration liability, measurement input 0.17        
GigPeak, Inc. | Restricted Stock Units (RSUs)          
Business Acquisition [Line Items]          
Fair value of partially vested employee equity awards related to pre-combination services $ 3,400,000        
Compensation cost not yet recognized $ 3,400,000        
Compensation cost not yet recognized, period for recognition 2 years 7 months 6 days