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BALANCE SHEET COMPONENTS - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Property, Plant and Equipment [Line Items]      
Total property and equipment—gross $ 212,904 $ 146,973  
Less accumulated depreciation and amortization (127,793) (88,901)  
Total property and equipment—net 85,111 58,072  
Depreciation $ 43,700 36,200 $ 26,400
Computer, production, engineering and other equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (In months) 36 months    
Total property and equipment—gross $ 131,805 85,280  
Demonstration units      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (In months) 12 months    
Total property and equipment—gross $ 53,547 46,387  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment—gross $ 19,916 10,562  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (In months) 60 months    
Total property and equipment—gross $ 7,636 $ 4,744