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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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