Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Parenthetical) (Detail) - MAP to Growth - Severance and Benefit Costs (Credits) - Position	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	5	9
Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	2	39
Consumer Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated		3
Specialty Products Group ("SPG") Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	16	28