Restructuring - Additional Information (Detail) - 2020 MAP to Growth - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018	May 31, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring plan, expected to be formulated			During the second quarter ended November 30, 2018
Increase in current total expected costs			$ 4,600,000
Restructuring plan, anticipated to be completed			by the end of calendar year 2020
Consumer Group ("Consumer") Segment | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	$ 6,300,000	$ 1,000.0	$ 7,200,000	$ 1,300
Inventory-related charges, favorable adjustment					$ 200,000
Performance Coatings Group ("PCG") Segment | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	$ 1,000,000.0	2,300	3,100,000	6,600
Construction Products Group ("CPG") Segment | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges		$ 300	300,000	$ 500
Severance and Benefit Charges
Restructuring Cost And Reserve [Line Items]
Increase in current total expected costs			$ 4,600,000