Income Taxes - Summary of Reconciliation of Beginning and Ending Balance of Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 116,212	$ 131,019
Increases in unrecognized tax benefits related to prior year tax positions	5,390	41,346
Decreases in unrecognized tax benefits related to prior year tax positions	(43,783)	(71,092)
Increases in unrecognized tax benefits related to current year tax positions	9,226	16,927
Decreases in unrecognized tax benefits related to settlements with taxing authorities	(1,411)	(1,624)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(2,472)	(964)
Increases in unrecognized tax benefits acquired	778	0
Changes in unrecognized tax benefits due to foreign currency translation	(791)	600
Ending Balance	$ 83,149	$ 116,212