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Acquisitons - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Aug. 09, 2017
Jul. 31, 2017
May 26, 2017
Jan. 26, 2017
Jun. 29, 2018
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Business Acquisition [Line Items]                
Equity interests issued and issuable       $ 465,100   $ 0 $ 0 $ 465,082
Purchase price holdback           0 375  
Goodwill           314,727 314,076  
Contingent consideration           0 585  
Applied Micro Circuits Corporation                
Business Acquisition [Line Items]                
Aggregate consideration       695,400     695,380  
Cash paid       287,100        
Cash acquired from acquisition       56,800        
Equity interests issued and issuable       465,100        
Equity interests issued and issuable       453,632        
Transaction costs           $ 0 0 11,900
Payments to acquire businesses       287,060        
Goodwill             184,629  
Intangible assets             412,848  
Applied Micro Circuits Corporation | Equity Issuance Costs                
Business Acquisition [Line Items]                
Transaction costs               1,000
Picometrix                
Business Acquisition [Line Items]                
Aggregate consideration $ 29,500              
Transaction costs             0 $ 200
Payments to acquire businesses 33,500       $ 33,500      
Indemnification assets $ 4,000              
Goodwill         7,769      
Intangible assets         $ 19,000      
Antario                
Business Acquisition [Line Items]                
Aggregate consideration   $ 4,800            
Payments to acquire businesses   5,800            
Purchase price holdback   $ 1,000            
Goodwill             1,600  
Intangible assets             4,100  
Triple Play Communications                
Business Acquisition [Line Items]                
Aggregate consideration     $ 2,200          
Payments to acquire businesses     2,600          
Goodwill             3,700  
Intangible assets             200  
Contingent consideration     $ 400          
Employee Stock Options And Restricted Stock | Applied Micro Circuits Corporation                
Business Acquisition [Line Items]                
Equity interest issued or issuable value assigned       14,500        
Equity interests issued and issuable       $ 9,300     $ 9,307