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Stock-Based Compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Apr. 30, 2017
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Options, Outstanding, Beginning balance | shares 1,881
Number of Options, Granted | shares 381
Number of Options, Exercised | shares (274)
Number of Options, Forfeited or expired | shares (13)
Number of Options, Outstanding, Ending balance | shares 1,975
Number of Options, Vested or expected to vest | shares 1,948
Number of Options, Exercisable | shares 1,040
Weighted-Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares $ 58.41
Weighted-Average Exercise Price Per Share, Granted | $ / shares 107.68
Weighted-Average Exercise Price Per Share, Exercised | $ / shares 44.50
Weighted-Average Exercise Price Per Share, Forfeited or expired | $ / shares 79.30
Weighted-Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 69.72
Weighted-Average Exercise Price Per Share, Vested or expected to vest | $ / shares 69.37
Weighted-Average Exercise Price Per Share, Exercisable | $ / shares $ 54.03
Aggregate Intrinsic Value, Outstanding | $ $ 109,561
Aggregate Intrinsic Value, Vested or expected to vest | $ 108,740
Aggregate Intrinsic Value, Exercisable | $ $ 74,014
Weighted Average Remaining Term, Outstanding 6 years 10 months 24 days
Weighted Average Remaining Term, Vested or expected to vest 6 years 9 months 18 days
Weighted Average Remaining Term, Exercisable 5 years 2 months 12 days