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GOODWILL AND PURCHASED INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (177,446) $ (132,179)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 8 months 12 days  
Total intangible assets $ 957,794 957,854
Goodwill 1,279,897 1,278,380
Existing technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 585,867 566,881
Accumulated Amortization $ (116,295) (86,301)
Weighted Average Remaining Useful Life 4 years  
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 245,437 245,481
Accumulated Amortization $ (48,306) (36,245)
Weighted Average Remaining Useful Life 4 years 7 months 6 days  
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 115,600 115,600
Accumulated Amortization (12,845) (9,633)
In-process R&D    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,000  
In-process R&D    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 10,890 $ 29,892