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		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	11	12	16	21
Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated		11	3	50
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		1	16	24
Number of positions not eliminated		5
Corporate/Other Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	1