Restructuring - Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Parenthetical) (Details) - USD ($)		3 Months Ended			6 Months Ended
		Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022
Restructuring Cost and Reserve [Line Items]
Current Year Charges		$ 1,239,000		$ 1,272,000	$ 7,737,000	$ 2,626,000
MAP 2025
Restructuring Cost and Reserve [Line Items]
Current Year Charges		1,239,000			7,737,000
MAP 2025 | Other Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Current Year Charges		0			4,555,000
MAP 2025 | Performance Coatings Segment
Restructuring Cost and Reserve [Line Items]
Current Year Charges		306,000			5,722,000
MAP 2025 | Performance Coatings Segment | Other Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Current Year Charges	[1]	0			4,555,000
MAP 2025 | Performance Coatings Segment | Tradename | Other Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Impairment of indefinite-lived assets		$ 0	$ 3,300,000		$ 3,300,000

[1] Of the $4.6 million of other restructuring costs incurred for the six-month period ending November 30, 2023, $3.3 million is associated with the impairment of an indefinite-lived tradename described above.