Income Taxes - Summary of Reconciliation of Beginning and Ending Balance of Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 106,542	$ 132,054
Increases in unrecognized tax benefits related to prior year tax positions	3,117	7,205
Decreases in unrecognized tax benefits related to prior year tax positions	(49,456)	(43,944)
Increases in unrecognized tax benefits related to current year tax positions	31,007	13,880
Decreases in unrecognized tax benefits related to settlements with taxing authorities	(784)	(333)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(2,635)	(2,659)
Increases in unrecognized tax benefits acquired	1,934	49
Changes in unrecognized tax benefits due to foreign currency translation	1,912	290
Ending Balance	$ 91,637	$ 106,542