Restructuring - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Aug. 31, 2023	Nov. 30, 2024	Nov. 30, 2023
MAP 2025
Restructuring Cost And Reserve [Line Items]
Total expected costs decreased, amount		$ 0.9
MAP 2025 | Severance and benefit charges
Restructuring Cost And Reserve [Line Items]
Total expected costs increased, amount		0.7
MAP 2025 | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Total expected costs decreased, amount		$ 1.6
MAP 2025 | Other Restructuring Costs | Performance Coatings Segment | Trade name
Restructuring Cost And Reserve [Line Items]
Impairment of indefinite-lived assets	$ 3.3		$ 3.3
USL Restructuring | Universal Sealants
Restructuring Cost And Reserve [Line Items]
Loss on sale of Bridgecare services division	$ 4.5