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PREPAID EXPENSES AND OTHER (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Oct. 31, 2020
Capitalized Contract Cost [Line Items]
Prepaid expenses	$ 75,287		$ 70,647
Prepaid VAT and other taxes	70,735		72,838
Product demonstration equipment, net	35,411		44,793
Other non-trade receivables	17,808		21,981
Derivative assets	8,598		82
Deferred deployment expense	336		604
Prepaid expenses and other	323,283		308,084
Depreciation of product demonstration equipment	7,600	$ 6,500
CEWS receivable
Capitalized Contract Cost [Line Items]
CEWS receivable	1,229		0
Contract assets for unbilled accounts receivable, net
Capitalized Contract Cost [Line Items]
Contract assets	98,812		85,843
Capitalized contract acquisition costs
Capitalized Contract Cost [Line Items]
Contract assets	$ 15,067		$ 11,296

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