Income Taxes - Summary of Reconciliation of Beginning and Ending Balance of Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 131,019	$ 91,637
Increases in unrecognized tax benefits related to prior year tax positions	41,346	2,572
Decreases in unrecognized tax benefits related to prior year tax positions	(71,092)	(27,615)
Increases in unrecognized tax benefits related to current year tax positions	16,927	67,961
Decreases in unrecognized tax benefits related to settlements with taxing authorities	(1,624)	(175)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(964)	(8,828)
Increases in unrecognized tax benefits acquired	0	7,886
Changes in unrecognized tax benefits due to foreign currency translation	600	(2,419)
Ending Balance	$ 116,212	$ 131,019