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Stock-Based Compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares) | shares	1,487
Granted (in shares) | shares	92
Exercised (in shares) | shares	(64)
Forfeited or expired (in shares) | shares	(6)
Ending balance (in shares) | shares	1,509
Expected to vest (in shares) | shares	600
Exercisable (in shares) | shares	902
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (in dollars per share) | $ / shares	$ 122.45
Granted (in dollars per share) | $ / shares	201.50
Exercised (in dollars per share) | $ / shares	116.96
Forfeited or expired (in dollars per share) | $ / shares	146.89
Ending balance (in dollars per share) | $ / shares	127.40
Expected to vest (in dollars per share) | $ / shares	156.03
Exercisable (in dollars per share) | $ / shares	$ 108.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate Intrinsic Value, Outstanding | $	$ 80,152
Aggregate Intrinsic Value, Expected to vest | $	16,077
Aggregate Intrinsic Value, Exercisable | $	$ 63,938
Weighted Average Remaining Term, Outstanding	7 years
Weighted Average Remaining Term, Expected to vest	8 years 6 months
Weighted Average Remaining Term, Exercisable	5 years 10 months 24 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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