Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Income Tax Disclosure
Document Period End Date	Jan. 31, 2020
Estimated annual effective tax rate (benefit) expense	(20.50%)	(24.00%)
Deemed Repatriation, Impact of Tax Reform		$ (0.6)
Tax Cuts and Jobs Act of 2017, Excess Tax Benefits		0.3
Tax Cuts and Jobs Act of 2017, GILTI and FDII		$ 1.4
Liability for uncertain tax positions	$ 0.6
Valuation allowance	$ 1.6