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Restructuring - Additional Information (Detail) - 2020 MAP to Growth - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019 | May 31, 2019
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring plan, expected to be formulated |  |  | During the quarter ended November 30, 2018 |  |
Increase in current total expected costs |  |  | $ 7,500,000 |  |
Consumer Group ("Consumer") Segment | Cost of Sales |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Inventory-related charges | $ 200,000 | $ 800,000 | 7,400,000 | $ 2,100 |
Inventory-related charges, favorable adjustment |  |  |  |  | $ 200,000
Performance Coatings Group ("PCG") Segment | Cost of Sales |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Inventory-related charges | 100,000 | 900,000 | 3,200,000 | 7,500 |
Construction Products Group ("CPG") Segment | Cost of Sales |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Inventory-related charges | 100,000 | $ 200,000 | 300,000 | $ 700 |
Specialty Products Group ("SPG") Segment | Cost of Sales |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Inventory-related charges | $ 100,000 |  | 100,000 |  |
Severance and Benefit Charges |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Increase in current total expected costs |  |  | 4,600,000 |  |
Facility Closure and Other Related Costs |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Increase in current total expected costs |  |  | 2,500,000 |  |
Other Asset Write-offs |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Increase in current total expected costs |  |  | $ 400,000 |  |

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