Stock-Based Compensation - Summarized Information on Currently Outstanding Options (Parenthetical) (Detail) (USD $)	12 Months Ended
	Oct. 31, 2014
Price Range 14 to 28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower range limit	$ 14
Exercise price range, Upper range limit	$ 28
Price Range 29 to 44 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower range limit	$ 29
Exercise price range, Upper range limit	$ 44
Price Range 45 to 73 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower range limit	$ 45
Exercise price range, Upper range limit	$ 73