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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
3 Months Ended
Jan. 31, 2019
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Options, Outstanding, Beginning balance | shares 1,885
Number of Options, Granted | shares 348
Number of Options, Exercised | shares (66)
Number of Options, Forfeited or expired | shares (6)
Number of Options, Outstanding, Ending balance | shares 2,161
Number of Options, Vested or expected to vest | shares 2,133
Number of Options, Exercisable | shares 1,253
Weighted-Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares $ 85.33
Weighted-Average Exercise Price Per Share, Granted | $ / shares 124.89
Weighted-Average Exercise Price Per Share, Exercised | $ / shares 54.40
Weighted-Average Exercise Price Per Share, Forfeited or expired | $ / shares 110.74
Weighted-Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 92.58
Weighted-Average Exercise Price Per Share, Vested or expected to vest | $ / shares 92.18
Weighted-Average Exercise Price Per Share, Exercisable | $ / shares $ 75.89
Aggregate Intrinsic Value, Outstanding | $ $ 80,095
Aggregate Intrinsic Value, Vested or expected to vest | $ 79,920
Aggregate Intrinsic Value, Exercisable | $ $ 67,355
Weighted Average Remaining Term, Outstanding 6 years 10 months 24 days
Weighted Average Remaining Term, Vested or expected to vest 6 years 10 months 24 days
Weighted Average Remaining Term, Exercisable 5 years 7 months 6 days