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BALANCE SHEET COMPONENTS - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Jul. 31, 2018
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross $ 302,547   $ 302,547   $ 212,904
Less: accumulated depreciation (167,985)   (167,985)   (127,793)
Total property and equipment, net 134,562   134,562   85,111
Depreciation and amortization     55,740 $ 36,013  
Property, Plant and Equipment          
Property, Plant and Equipment [Line Items]          
Depreciation and amortization 16,400 $ 11,300 $ 43,300 $ 31,900  
Computer, production, engineering and other equipment          
Property, Plant and Equipment [Line Items]          
Estimated Useful Life     36 months    
Total property and equipment, gross 187,380   $ 187,380   131,805
Demonstration units          
Property, Plant and Equipment [Line Items]          
Estimated Useful Life     12 months    
Total property and equipment, gross 59,254   $ 59,254   53,547
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 42,862   $ 42,862   19,916
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Estimated Useful Life     60 months    
Total property and equipment, gross $ 13,051   $ 13,051   $ 7,636