Income Taxes - Summary of Reconciliation of Beginning and Ending Balance of Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 91,637	$ 106,542
Increases in unrecognized tax benefits related to prior year tax positions	2,572	3,117
Decreases in unrecognized tax benefits related to prior year tax positions	(27,615)	(49,456)
Increases in unrecognized tax benefits related to current year tax positions	67,961	31,007
Decreases in unrecognized tax benefits related to settlements with taxing authorities	(175)	(784)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(8,828)	(2,635)
Increases in unrecognized tax benefits acquired	7,886	1,934
Changes in unrecognized tax benefits due to foreign currency translation	(2,419)	1,912
Ending Balance	$ 131,019	$ 91,637