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BALANCE SHEET COMPONENTS - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Jul. 31, 2020
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 398,331   $ 394,397
Less: accumulated depreciation (265,175)   (251,225)
Total property and equipment, net 133,156   143,172
Impairment of leasehold 900   1,200
Depreciation and amortization 23,499 $ 22,462  
Property, Plant and Equipment      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 19,200 $ 18,100  
Computer, production, engineering and other equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 36 months    
Total property and equipment, gross $ 253,389   245,245
Demonstration units      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 12 months    
Total property and equipment, gross $ 66,750   66,569
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 62,142   65,557
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 60 months    
Total property and equipment, gross $ 16,050   $ 17,026