Restructuring - Additional Information (Detail) - 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]
Additions charged to expense		$ 1,239,000		$ 1,272,000	$ 7,737,000	$ 2,626,000
MAP to Growth
Restructuring Cost And Reserve [Line Items]
Restructuring costs		$ 0		$ 1,200,000	$ 0	$ 2,600,000
Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Additions charged to expense		Additions charged to expense	Additions charged to expense	Additions charged to expense
MAP 2025
Restructuring Cost And Reserve [Line Items]
Total expected costs increased, amount					$ 16,500,000
Additions charged to expense		$ 1,239,000			7,737,000
MAP 2025 | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		306,000			5,722,000
MAP 2025 | Severance and benefit charges
Restructuring Cost And Reserve [Line Items]
Total expected costs increased, amount					1,000,000
Additions charged to expense		1,117,000			3,016,000
MAP 2025 | Severance and benefit charges | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		213,000			1,044,000
MAP 2025 | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Total expected costs increased, amount					15,500,000
Additions charged to expense		122,000			166,000
MAP 2025 | Facility Closure and Other Related Costs | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		93,000			123,000
MAP 2025 | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Additions charged to expense		0			4,555,000
MAP 2025 | Other Restructuring Costs | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Additions charged to expense	[1]	0			4,555,000
MAP 2025 | Other Restructuring Costs | Performance Coatings Segment | Tradename
Restructuring Cost And Reserve [Line Items]
Impairment of indefinite-lived assets		$ 0	$ 3,300,000		$ 3,300,000
USL Restructuring | Universal Sealants
Restructuring Cost And Reserve [Line Items]
Loss on sale of Bridgecare services division			$ 4,500,000

[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.