Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Restructuring Cost And Reserve [Line Items]
Current Year Charges	$ 7,343	$ 8,679	$ 18,766	$ 36,479
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Current Year Charges	7,343	8,679	18,766	36,479
Cumulative Costs to Date	78,590		78,590
Total Expected Costs	110,946		110,946
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	4,816	3,420	11,331	29,015
Cumulative Costs to Date	53,807		53,807
Total Expected Costs	76,727		76,727
2020 MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,165	4,337	6,758	5,810
Cumulative Costs to Date	21,137		21,137
Total Expected Costs	29,788		29,788
2020 MAP to Growth | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	362	922	677	1,654
Cumulative Costs to Date	3,646		3,646
Total Expected Costs	4,431		4,431
2020 MAP to Growth | Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,734	2,057	5,178	8,813
Cumulative Costs to Date	20,967		20,967
Total Expected Costs	36,863		36,863
2020 MAP to Growth | Construction Products Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,018	1,315	3,625	7,308
Cumulative Costs to Date	14,854		14,854
Total Expected Costs	26,155		26,155
2020 MAP to Growth | Construction Products Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	484	737	1,282	1,134
Cumulative Costs to Date	4,251		4,251
Total Expected Costs	8,094		8,094
2020 MAP to Growth | Construction Products Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	232	5	271	371
Cumulative Costs to Date	1,862		1,862
Total Expected Costs	2,614		2,614
2020 MAP to Growth | Consumer Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,016	1,228	3,423	2,429
Cumulative Costs to Date	17,517		17,517
Total Expected Costs	21,785		21,785
2020 MAP to Growth | Consumer Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	445	374	1,992	1,470
Cumulative Costs to Date	9,370		9,370
Total Expected Costs	12,138		12,138
2020 MAP to Growth | Consumer Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	563	830	1,423	935
Cumulative Costs to Date	8,115		8,115
Total Expected Costs	9,615		9,615
2020 MAP to Growth | Consumer Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	8	24	8	24
Cumulative Costs to Date	32		32
Total Expected Costs	32		32
2020 MAP to Growth | Specialty Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	999	2,564	3,707	6,312
Cumulative Costs to Date	11,290		11,290
Total Expected Costs	17,733		17,733
2020 MAP to Growth | Specialty Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	643	1,308	1,057	4,985
Cumulative Costs to Date	6,393		6,393
Total Expected Costs	10,434		10,434
2020 MAP to Growth | Specialty Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	356	279	2,546	344
Cumulative Costs to Date	3,790		3,790
Total Expected Costs	6,159		6,159
2020 MAP to Growth | Specialty Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges		977	104	983
Cumulative Costs to Date	1,107		1,107
Total Expected Costs	1,140		1,140
2020 MAP to Growth | Corporate/Other Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,233	25	1,249	10,085
Cumulative Costs to Date	13,369		13,369
Total Expected Costs	13,369		13,369
2020 MAP to Growth | Corporate/Other Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,233	25	1,249	10,085
Cumulative Costs to Date	13,369		13,369
Total Expected Costs	13,369		13,369
2020 MAP to Growth | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,361	2,805	5,209	8,840
Cumulative Costs to Date	15,447		15,447
Total Expected Costs	21,196		21,196
2020 MAP to Growth | Performance Coatings Segment | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	477	398	3,408	5,167
Cumulative Costs to Date	9,821		9,821
Total Expected Costs	14,631		14,631
2020 MAP to Growth | Performance Coatings Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	762	2,491	1,507	3,397
Cumulative Costs to Date	4,981		4,981
Total Expected Costs	5,920		5,920
2020 MAP to Growth | Performance Coatings Segment | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	122	$ (84)	294	$ 276
Cumulative Costs to Date	645		645
Total Expected Costs	$ 645		$ 645