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Leases - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2020 USD ($)
Leases [Abstract]
Operating Lease, Cost	$ 2.5	$ 4.8
Operating Lease, Payments		$ 2.3
Weighted average remaining lease term for operating leases	4 years 9 months 18 days	4 years 9 months 18 days
Weighted average discount rate for operating leases	5.00%	5.00%

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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