Restructuring - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	$ 39.6	$ 29.4	$ 43.7
Consumer Segment
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	28.8	10.5	36.5
CPG Segment
Restructuring Cost And Reserve [Line Items]
Inventory-related charges		1.0	1.2
PCG Segment
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	$ 3.2	9.0
2020 MAP to Growth
Restructuring Cost And Reserve [Line Items]
Restructuring plan, expected to be formulated	During the second quarter ended November 30, 2018
2020 MAP to Growth | Consumer Segment | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	$ 16.3	2.1	36.5
Inventory-related charges, favorable adjustment		0.2
2020 MAP to Growth | CPG Segment | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	0.7	1.0	$ 1.2
2020 MAP to Growth | PCG Segment | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	3.2	$ 9.0
2020 MAP to Growth | SPG Segments | Cost of Sales
Restructuring Cost And Reserve [Line Items]
Inventory-related charges	0.1
2020 MAP to Growth | Severance and Benefit Costs
Restructuring Cost And Reserve [Line Items]
Decrease in current total expected costs	4.3
2020 MAP to Growth | Facility Closure and Other Related Costs
Restructuring Cost And Reserve [Line Items]
Increase in current total expected costs	0.5
2020 MAP to Growth | Other Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Increase in current total expected costs	$ 3.8