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Related Party Transactions - Additional Information (Details) - USD ($)
2 Months Ended 3 Months Ended
Nov. 16, 2015
Sep. 26, 2015
Sep. 27, 2014
Related Party Transaction [Line Items]      
Research and development   $ 34,400,000 $ 35,000,000
Transactions with Viavi      
Related Party Transaction [Line Items]      
Agreement contains purchase commitment   15,000,000  
Purchases from related party   0  
Revenue from related parties   800,000  
Research and development   500,000  
Sublease rental income   100,000  
Amount due from related party   $ 800,000  
Transactions with Viavi | Subsequent Event      
Related Party Transaction [Line Items]      
Purchases from related party $ 4,600,000