Summary of Charges Recorded in Connection with Restructuring by Reportable Segment (Parenthetical) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020 USD ($) Position	Feb. 28, 2019 USD ($) Position	Feb. 29, 2020 USD ($) Position	Feb. 28, 2019 USD ($) Position Executive
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 7,343	$ 8,679	$ 18,766	$ 36,479
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	7,343	8,679	18,766	36,479
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 4,816	$ 3,420	$ 11,331	$ 29,015
Construction Products Segment | 2020 MAP to Growth Related to Current Elimination | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position	27	3	73	71
Construction Products Segment | 2020 MAP to Growth Plan Related to Legal Function
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position				1
Restructuring Charges				$ 200
Construction Products Segment | 2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 2,734	$ 2,057	$ 5,178	8,813
Construction Products Segment | 2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 2,018	1,315	$ 3,625	$ 7,308
Construction Products Segment | 2020 MAP to Growth | Construction Segment Executives
Restructuring Cost And Reserve [Line Items]
Number of corporate executives | Executive				3
Corporate/Other Segment | 2020 MAP to Growth Related to Current Elimination | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position	2		2
Corporate/Other Segment | 2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 1,233	25	$ 1,249	$ 10,085
Corporate/Other Segment | 2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 1,233	$ 25	$ 1,249	$ 10,085
Number of corporate executives | Executive				2
Corporate/Other Segment | 2020 MAP to Growth | Vesting Equity Awards
Restructuring Cost And Reserve [Line Items]
Number of corporate executives | Executive				2
Performance Coatings Segment | 2020 MAP to Growth Related to Current Elimination | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position	1		70
Performance Coatings Segment | 2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position		1		103
Restructuring Charges	$ 1,361	$ 2,805	$ 5,209	$ 8,840
Performance Coatings Segment | 2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 477	$ 398	$ 3,408	$ 5,167
Consumer Segment | 2020 MAP to Growth Related to Current Elimination | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position	5		16
Consumer Segment | 2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position		9		18
Restructuring Charges	$ 1,016	$ 1,228	$ 3,423	$ 2,429
Consumer Segment | 2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 445	$ 374	$ 1,992	$ 1,470
Specialty Segment | 2020 MAP to Growth Related to Current Elimination | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position	4		63
Specialty Segment | 2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Number of positions eliminated | Position		10		130
Restructuring Charges	$ 999	$ 2,564	$ 3,707	$ 6,312
Specialty Segment | 2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	$ 643	$ 1,308	$ 1,057	$ 4,985
Specialty Segment | 2020 MAP to Growth | Specialty Segment
Restructuring Cost And Reserve [Line Items]
Number of corporate executives | Executive				4