Stock Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding	647,800
Number of Options, Granted	0
Number of Options, Exercised	(130,000)
Number of Options, Forfeited	(10,000)
Number of Options, Expired	(223,000)
Number of Options, Outstanding	284,800	647,800
Number of Options, Exercisable	284,800
Weighted-Average Exercise Price, Outstanding	$ 7.64
Weighted-Average Exercise Price, Granted	0
Weighted-Average Exercise Price, Exercised	7.90
Weighted-Average Exercise Price, Forfeited	8.11
Weighted-Average Exercise Price, Expired	7.32
Weighted-Average Exercise Price, Outstanding	7.77	$ 7.64
Weighted-Average Exercise Price, Exercisable	$ 7.77
Weighted-Average Remaining Contractual Term, Outstanding (in years)	5 years	5 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Exercised (in years)	5 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable (in years)	5 years
Aggregate Intrinsic Value of Options, Outstanding	$ 3,113
Aggregate Intrinsic Value of Options, Exercised	569
Aggregate Intrinsic Value of Options, Forfeited	7
Aggregate Intrinsic Value of Options, Expired	161
Aggregate Intrinsic Value of Options, Outstanding	79	$ 3,113
Aggregate Intrinsic Value of Options, Exercisable	$ 79

Share based compensation arrangement by share based payment award options expirations in period total intrinsic value.

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Share based compensation arrangement by share based payment award options forfeitures in period total intrinsic value.

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Sharebased compensation arrangement by sharebased payment award options exercised weighted average remaining contractual term.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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