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Stock Compensation - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2018 USD ($) $ / shares shares	Oct. 31, 2017 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding | shares	3,063,668
Number of Shares, Granted | shares	0
Number of Shares, Exercised | shares	(1,757,984)
Number of Shares, Cancelled | shares	(499,934)
Number of Shares, Outstanding | shares	805,750	3,063,668
Number of Shares, Exercisable | shares	644,134
Weighted-Average Exercise Price Per Share, Outstanding | $ / shares	$ 5.80
Weighted-Average Exercise Price Per Share, Granted | $ / shares	0
Weighted-Average Exercise Price Per Share, Exercised | $ / shares	5.53
Weighted-Average Exercise Price Per Share, Cancelled | $ / shares	4.61
Weighted-Average Exercise Price Per Share, Outstanding | $ / shares	7.12	$ 5.80
Weighted-Average Exercise Price Per Share, Exercisable | $ / shares	$ 7.32
Weighted-Average Remaining Contractual Term (in years)	6 years 3 months 18 days	6 years 9 months 18 days
Aggregate Intrinsic Value of In-the-Money Options, Outstanding | $	$ 3,055	$ 61,282
Aggregate Intrinsic Value of In-the-Money Options, Exercisable | $	$ 2,311

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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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For presentations that combine terminations, 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 or that expired.

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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 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 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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