Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Parenthetical) (Detail) - MAP to Growth - Severance and Benefit Costs - Position	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	9	21
Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	39	51
Consumer Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	3	2
Specialty Products Group ("SPG") Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	28	10