Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Nov. 01, 2018	Oct. 31, 2018
Capitalized Contract Cost [Line Items]
Prepaid VAT and other taxes	$ 77,788			$ 82,518
Product demonstration equipment, net	39,323			37,623
Prepaid expenses	31,469			32,987
Other non-trade receivables	11,513			25,716
Financing receivable	0			626
Deferred deployment expense	0			19,342
Derivative assets	764			133
Prepaid expenses and other	243,669		$ 220,415	198,945
Depreciation of product demonstration equipment	4,300	$ 4,600
Contract assets for unbilled accounts receivable
Capitalized Contract Cost [Line Items]
Contract assets	74,439			0
Capitalized commissions - short term
Capitalized Contract Cost [Line Items]
Contract assets	$ 8,373			$ 0