Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions	Jul. 31, 2014	Oct. 31, 2012
2012 Repurchase Program
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase		$ 300.0
2014 Repurchase Program
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase	$ 350.0