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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

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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The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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