Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Restructuring Cost And Reserve [Line Items]
Current Year Charges	$ 2,977	$ 4,918	$ 3,988	$ 9,151
MAP to Growth
Restructuring Cost And Reserve [Line Items]
Current Year Charges	2,977	4,918	3,988	9,151
Cumulative Costs to Date	115,023		115,023
Total Expected Costs	118,676		118,676
MAP to Growth | Severance and Benefit Costs (Credits)
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,805	2,135	1,528	4,612
Cumulative Costs to Date	73,147		73,147
Total Expected Costs	74,160		74,160
MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,171	2,288	2,457	3,809
Cumulative Costs to Date	33,337		33,337
Total Expected Costs	35,977		35,977
MAP to Growth | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1	495	3	730
Cumulative Costs to Date	8,539		8,539
Total Expected Costs	8,539		8,539
MAP to Growth | Construction Products Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	680	1,896	731	2,481
Cumulative Costs to Date	30,577		30,577
Total Expected Costs	30,839		30,839
MAP to Growth | Construction Products Segment | Severance and Benefit Costs (Credits)
Restructuring Cost And Reserve [Line Items]
Current Year Charges	177	1,394	(316)	1,574
Cumulative Costs to Date	20,972		20,972
Total Expected Costs	21,072		21,072
MAP to Growth | Construction Products Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	503	440	1,043	808
Cumulative Costs to Date	7,623		7,623
Total Expected Costs	7,785		7,785
MAP to Growth | Construction Products Segment | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	0	62	4	99
Cumulative Costs to Date	1,982		1,982
Total Expected Costs	1,982		1,982
MAP to Growth | Performance Coatings Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	250	1,542	786	2,898
Cumulative Costs to Date	24,691		24,691
Total Expected Costs	26,121		26,121
MAP to Growth | Performance Coatings Segment | Severance and Benefit Costs (Credits)
Restructuring Cost And Reserve [Line Items]
Current Year Charges	0	802	128	1,841
Cumulative Costs to Date	16,487		16,487
Total Expected Costs	16,832		16,832
MAP to Growth | Performance Coatings Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	250	556	658	844
Cumulative Costs to Date	7,287		7,287
Total Expected Costs	8,372		8,372
MAP to Growth | Performance Coatings Segment | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	0	184	0	213
Cumulative Costs to Date	917		917
Total Expected Costs	917		917
MAP to Growth | Consumer Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	271	985	511	2,470
Cumulative Costs to Date	29,319		29,319
Total Expected Costs	29,815		29,815
MAP to Growth | Consumer Segment | Severance and Benefit Costs (Credits)
Restructuring Cost And Reserve [Line Items]
Current Year Charges	0	(4)	0	786
Cumulative Costs to Date	12,307		12,307
Total Expected Costs	12,307		12,307
MAP to Growth | Consumer Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	271	785	511	1,382
Cumulative Costs to Date	12,592		12,592
Total Expected Costs	13,088		13,088
MAP to Growth | Consumer Segment | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	0	204	0	302
Cumulative Costs to Date	4,420		4,420
Total Expected Costs	4,420		4,420
MAP to Growth | Specialty Products Group ("SPG") Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	263	495	447	1,302
Cumulative Costs to Date	15,385		15,385
Total Expected Costs	16,850		16,850
MAP to Growth | Specialty Products Group ("SPG") Segment | Severance and Benefit Costs (Credits)
Restructuring Cost And Reserve [Line Items]
Current Year Charges	115	(57)	203	411
Cumulative Costs to Date	8,330		8,330
Total Expected Costs	8,898		8,898
MAP to Growth | Specialty Products Group ("SPG") Segment | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	147	507	245	775
Cumulative Costs to Date	5,835		5,835
Total Expected Costs	6,732		6,732
MAP to Growth | Specialty Products Group ("SPG") Segment | Other Restructuring Costs
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1	45	(1)	116
Cumulative Costs to Date	1,220		1,220
Total Expected Costs	1,220		1,220
MAP to Growth | Corporate/Other Segment
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,513	0	1,513	0
Cumulative Costs to Date	15,051		15,051
Total Expected Costs	15,051		15,051
MAP to Growth | Corporate/Other Segment | Severance and Benefit Costs (Credits)
Restructuring Cost And Reserve [Line Items]
Current Year Charges	1,513	$ 0	1,513	$ 0
Cumulative Costs to Date	15,051		15,051
Total Expected Costs	$ 15,051		$ 15,051