Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Restructuring Cost And Reserve [Line Items]
Current Year Charges	$ 6,622	$ 20,076
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Current Year Charges	6,622	20,076
Cumulative Costs to Date	66,446
Total Expected Costs	98,871
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	3,786	19,062
Cumulative Costs to Date	46,262
Total Expected Costs	67,554
2020 MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,772	436
Cumulative Costs to Date	17,151
Total Expected Costs	26,731
2020 MAP to Growth | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	64	578
Cumulative Costs to Date	3,033
Total Expected Costs	4,586
2020 MAP to Growth | Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	848	2,797
Cumulative Costs to Date	16,636
Total Expected Costs	26,515
2020 MAP to Growth | Construction Products Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	160	2,419
Cumulative Costs to Date	11,389
Total Expected Costs	20,182
2020 MAP to Growth | Construction Products Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	688	13
Cumulative Costs to Date	3,657
Total Expected Costs	4,404
2020 MAP to Growth | Construction Products Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges		365
Cumulative Costs to Date	1,590
Total Expected Costs	1,929
2020 MAP to Growth | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,609	5,041
Cumulative Costs to Date	12,847
Total Expected Costs	22,513
2020 MAP to Growth | Performance Coatings Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,500	4,405
Cumulative Costs to Date	8,913
Total Expected Costs	14,617
2020 MAP to Growth | Performance Coatings Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	109	423
Cumulative Costs to Date	3,583
Total Expected Costs	6,689
2020 MAP to Growth | Performance Coatings Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges		213
Cumulative Costs to Date	351
Total Expected Costs	1,207
2020 MAP to Growth | Consumer Products Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,283	1,019
Cumulative Costs to Date	15,378
Total Expected Costs	20,996
2020 MAP to Growth | Consumer Products Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	767	1,019
Cumulative Costs to Date	8,145
Total Expected Costs	11,663
2020 MAP to Growth | Consumer Products Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	516
Cumulative Costs to Date	7,208
Total Expected Costs	9,308
2020 MAP to Growth | Consumer Products Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Cumulative Costs to Date	25
Total Expected Costs	25
2020 MAP to Growth | Specialty Products Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,889	2,220
Cumulative Costs to Date	9,472
Total Expected Costs	16,734
2020 MAP to Growth | Specialty Products Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	366	2,220
Cumulative Costs to Date	5,702
Total Expected Costs	8,979
2020 MAP to Growth | Specialty Products Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,459
Cumulative Costs to Date	2,703
Total Expected Costs	6,330
2020 MAP to Growth | Specialty Products Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	64
Cumulative Costs to Date	1,067
Total Expected Costs	1,425
2020 MAP to Growth | Corporate/Other Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	(7)	8,999
Cumulative Costs to Date	12,113
Total Expected Costs	12,113
2020 MAP to Growth | Corporate/Other Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	(7)	$ 8,999
Cumulative Costs to Date	12,113
Total Expected Costs	$ 12,113