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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)		$ 2.5	$ 2.9	$ (1.9)	$ (11.0)
Pre-tax (income) loss		30.80%	27.90%	17.80%	(185.80%)
Net discrete tax expense (benefit) related to share-based compensation		$ 0.4		$ 0.8	$ (2.3)
Net discrete tax expense (benefit) realted to new tax legislation			$ 0.1
Net discrete tax benefits					(12.6)
Tax reform act, benefit related to remeasurement of net deferred tax liabilities					$ 10.4	$ 11.3
Corporate tax rate	35.00%			21.00%
Change in valuation allowance		0.0		$ 0.0
Unrecognized tax benefits		2.4		2.4		$ 2.2
Unrecognized tax benefits that would affect the annual effective income tax rate if recognized		$ 0.2		$ 0.2

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Income tax expense benefit of discrete tax expenses benefit related to share-based compensation.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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