Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Income Tax Disclosure [Abstract]
Effective tax rates	21.00%	20.90%	19.80%	23.90%
Income tax provision included discrete tax benefit due to share-based payment transactions	$ 138	$ 2,149	$ 2,675	$ 3,017
Provisional discrete tax (benefit) expense				$ 4,866

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.

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