Contingent Liabilities and Environmental Reserves - Additional Information (Detail) $ in Millions	12 Months Ended
	Oct. 31, 2017 USD ($) reconditioning_facilities	Apr. 30, 2018 USD ($)
Site Contingency [Line Items]
Number of reconditioning facilities subject to litigation | reconditioning_facilities	3
Environmental liability reserves	$ 7.1	$ 7.2
European Drum Facilities
Site Contingency [Line Items]
Environmental liability reserves	4.3	4.3
Life Cycle Management and Recycling Facilities
Site Contingency [Line Items]
Environmental liability reserves	0.3	0.2
Owned by Other Company
Site Contingency [Line Items]
Environmental liability reserves	1.1	1.0
Other Facilities
Site Contingency [Line Items]
Environmental liability reserves	1.4	1.7
Wrongful Termination Lawsuits | Pending Litigation
Site Contingency [Line Items]
Estimated liability recorded for legal proceedings	$ 5.7	$ 3.0