Income Taxes - Income Tax (Benefit)/Expense at Federal Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax (benefit) provision at federal statutory rate	$ (9.7)	$ (3.5)	$ 0.5
Taxes on foreign income which differ from the U.S. statutory rate			(0.3)
State (benefit) expense	(2.3)	(0.2)	0.5
CARES Act impact	(3.5)
Manufacturing and research incentives	(0.9)	(0.6)	(2.7)
Nondeductible items	0.8	0.2	0.7
Uncertain tax positions	0.4	(0.1)	(0.4)
Valuation allowance	0.2		2.2
Remeasurement of deferred taxes - U.S. Tax Reform			(11.3)
Bargain purchase gain	(2.2)
Stock-based compensation	1.4	0.8
Other items	0.2	(0.1)
(Benefit) provision for income taxes	$ (15.6)	$ (3.5)	$ (10.8)