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Goodwill and Intangible Assets, Net - Estimated Remaining Future Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 01, 2018
Finite-Lived Intangible Assets [Line Items]    
2019 (Remaining 6 months) $ 22,585  
2020 45,812  
2021 44,856  
2022 39,595  
2023 and thereafter 18,156  
IPR&D 579,185 $ 566,330
Intangible assets, net 174,886 180,781
Total amortizable purchased intangible assets    
Finite-Lived Intangible Assets [Line Items]    
IPR&D 575,303 557,313
Intangible assets, net 171,004 173,780
In-process research and development (IPR&D)    
Finite-Lived Intangible Assets [Line Items]    
IPR&D 3,882 9,017
Intangible assets, net $ 3,882 $ 7,001