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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Oct. 31, 2018
Income Tax Disclosure [Line Items]
Income tax expense (benefit)		$ 1.9	$ 3.8	$ 0.0	$ (7.2)
Pre-tax (income) loss		25.70%	17.20%	(0.20%)	(25.80%)
Net discrete tax expense (benefit) related to provision-to-return adjustments		$ 0.1			$ (1.1)
Net discrete tax expense (benefit) related to new tax legislation			$ (2.1)
Net discrete tax expense (benefit) related to share-based compensation				$ 0.8
Net discrete tax benefits					(14.7)
Tax reform act, benefit related to remeasurement of net deferred tax liabilities					$ 12.5	$ 11.3
Corporate tax rate	35.00%			21.00%
Change in valuation allowance		0.0		$ 0.0
Unrecognized tax benefits		2.5		2.5		$ 2.2
Unrecognized tax benefits that would affect the annual effective income tax rate if recognized		$ 0.2		0.2
Maximum [Member]
Income Tax Disclosure [Line Items]
Income tax expense (benefit)				$ (0.1)

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