Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Oct. 31, 2016
Restructuring and Related Costs [Line Items]
Restructuring charges	$ (0.3)	$ 2.3
Decrease in restructuring reserve	1.3
Amounts Remaining to be Incurred	17.8		$ 16.1
Employee Separation Costs
Restructuring and Related Costs [Line Items]
Restructuring charges	(0.8)
Other Costs
Restructuring and Related Costs [Line Items]
Restructuring charges	0.5
Employee Separation Costs and Other Restructuring Costs
Restructuring and Related Costs [Line Items]
Restructuring charges	$ 1.0