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Net Income per Share - Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Jul. 31, 2013
Earnings Per Share [Abstract]        
Net income $ 65,656 $ 52,297 $ 196,669 $ 190,910
Weighted-average common shares for basic net income per share (shares) 155,194 153,915 154,611 152,969
Dilutive effect of potential common shares from equity-based compensation (shares) 2,428 3,141 2,642 3,246
Weighted-average common shares for diluted net income per share (shares) 157,622 157,056 157,253 156,215
Basic (in USD per share) $ 0.42 $ 0.34 $ 1.27 $ 1.25
Diluted (in USD per share) $ 0.42 $ 0.33 $ 1.25 $ 1.22
Anti-dilutive employee stock-based awards excluded (shares) 2,875 [1] 1,648 [1] 2,057 [1] 2,179 [1]
[1] These stock options and unvested restricted stock units and restricted stock awards were anti-dilutive for the respective periods and are excluded in calculating diluted net income per share. While such awards were antidilutive for the respective periods, they could be dilutive in the future.