Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Dec. 31, 2017	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Oct. 31, 2019	Oct. 31, 2018
Income Tax Disclosure [Line Items]
Net operating loss carryforwards							$ 3.5
Estimate income tax effects due to CARES Act		$ 3.5
Federal statutory income tax rate	35.00%			21.00%
Income tax expense (benefit)		$ (0.5)	$ 1.9	$ (13.2)
Pre-tax (income) loss		11.60%	(25.70%)	39.40%	(0.20%)
Net discrete tax expense (benefit) related to net operating loss carrybacks		$ (0.8)		$ (4.6)
Net discrete tax expense (benefit) related to share-based compensation			$ 0.1		$ 0.8
Unrecognized tax benefits		2.8		2.8		$ 2.6
Unrecognized tax benefits that would affect the annual effective income tax rate if recognized		$ 0.4		$ 0.4
Maximum [Member]
Income Tax Disclosure [Line Items]
Income tax expense (benefit)					$ 0.1