Financial Assets and Liabilities - Ineffective Portion and Portion Excluded from Effectiveness Testing of Derivative Hedge Gains (Losses) (Detail) - Foreign Exchange Contracts - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in statement of operations on derivatives (ineffective portion)(1)	$ (5)	$ 201	$ 164	$ 455
Amount of gain (loss) recognized in statement of operations on derivatives (excluded from effectiveness testing)(2)	$ 1,499	$ 2,140	$ 2,617	$ 3,541