Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Parenthetical) (Detail) - MAP to Growth - Severance and Benefit Costs - Position	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	3	27	24	73
Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	5	1	55	70
Consumer Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	0	5	3	16
Specialty Products Group ("SPG") Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated	3	4	27	63
Corporate/Other Segment
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated		2		2