Ineffective Portion and Portion Excluded from Effectiveness Testing of Derivative Hedge Gains (Losses) (Detail) (Foreign Exchange Contracts, USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Apr. 30, 2013		Apr. 30, 2012		Apr. 30, 2013		Apr. 30, 2012
Foreign Exchange Contracts
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in income statement on derivatives (ineffective portion)	$ (202)	[1]	$ (22)	[1]	$ 165	[1]	$ 54	[1]
Amount of gain (loss) recognized in income statement on derivatives (excluded from effectiveness testing)	$ 790	[2]	$ 466	[2]	$ 1,262	[2]	$ 867	[2]

[1] The ineffective portion includes forecast inaccuracies.

[2] The portion excluded from effectiveness includes the discount earned or premium paid for the contracts.