Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Nov. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 1,184,119
Other comprehensive loss, net of tax	$ (10,224)	$ (5,682)	(10,608)	$ (4,720)
Ending balance	1,277,105		1,277,105
Unamortized net gains on cash flow hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	76	176	100	200
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-01)		0		0
Beginning Balance, as adjusted					$ 200
Other comprehensive income (loss) before reclassifications	0	0	0	0
Reclassification adjustments, before tax	(33)	(33)	(66)	(67)
Tax impact	8	7	17	17
Other comprehensive loss, net of tax	(25)	(26)	(49)	(50)
Ending balance	51	150	51	150
Net unrealized gains on available-for-sale investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			0	3,714
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-01)		(3,714)		(3,714)
Beginning Balance, as adjusted					0
Other comprehensive income (loss) before reclassifications			0	0
Reclassification adjustments, before tax			0	0
Tax impact			0	0
Other comprehensive loss, net of tax			0	0
Ending balance	0	0	0	0
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(58,777)	(56,109)	(58,417)	(57,095)
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-01)		0		0
Beginning Balance, as adjusted					(57,095)
Other comprehensive income (loss) before reclassifications	(10,199)	(5,656)	(10,559)	(4,670)
Reclassification adjustments, before tax	0	0	0	0
Tax impact	0	0	0	0
Other comprehensive loss, net of tax	(10,199)	(5,656)	(10,559)	(4,670)
Ending balance	(68,976)	(61,765)	(68,976)	(61,765)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(58,701)	(55,933)	(58,317)	(53,181)
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-01)		(3,714)		(3,714)
Beginning Balance, as adjusted					$ (56,895)
Other comprehensive income (loss) before reclassifications	(10,199)	(5,656)	(10,559)	(4,670)
Reclassification adjustments, before tax	(33)	(33)	(66)	(67)
Tax impact	8	7	17	17
Other comprehensive loss, net of tax	(10,224)	(5,682)	(10,608)	(4,720)
Ending balance	$ (68,925)	$ (61,615)	$ (68,925)	$ (61,615)