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BALANCE SHEET COMPONENTS - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Jul. 31, 2017
Property, Plant and Equipment [Line Items]      
Total property and equipment—gross $ 166,224   $ 146,973
Less accumulated depreciation and amortization (98,649)   (88,901)
Total property and equipment—net 67,575   58,072 [1]
Depreciation and amortization 11,333 $ 8,572 [2]  
Property, Plant and Equipment      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 10,200 $ 8,200  
Computer, production, engineering and other equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (In months) 36 months    
Total property and equipment—gross $ 97,027   85,280
Demonstration units      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (In months) 12 months    
Total property and equipment—gross $ 49,109   46,387
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment—gross $ 14,605   10,562
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (In months) 60 months    
Total property and equipment—gross $ 5,483   $ 4,744
[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.
[2] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.