Financial Instruments, Risk Management Activities, and Fair Values (Concentrations table) (Details)	12 Months Ended
	May 31, 2020
Net Sales [Member] | Walmart [Member]
Product Information [Line Items]
Concentration Risk Percentage	21.00%
Net Sales [Member] | Walmart [Member] | North America Retail [Member]
Product Information [Line Items]
Concentration Risk Percentage	30.00%
Net Sales [Member] | Walmart [Member] | Convenience Stores and Foodservice Segment [Member]
Product Information [Line Items]
Concentration Risk Percentage	8.00%
Net Sales [Member] | Walmart [Member] | Europe and Australia [Member]
Product Information [Line Items]
Concentration Risk Percentage	1.00%
Net Sales [Member] | Walmart [Member] | Asia and Latin America [Member]
Product Information [Line Items]
Concentration Risk Percentage	5.00%
Net Sales [Member] | Walmart [Member] | Pet [Member]
Product Information [Line Items]
Concentration Risk Percentage	12.00%
Net Sales [Member] | Five Largest Customers [Member] | North America Retail [Member]
Product Information [Line Items]
Concentration Risk Percentage	54.00%
Net Sales [Member] | Five Largest Customers [Member] | Convenience Stores and Foodservice Segment [Member]
Product Information [Line Items]
Concentration Risk Percentage	45.00%
Net Sales [Member] | Five Largest Customers [Member] | Europe and Australia [Member]
Product Information [Line Items]
Concentration Risk Percentage	24.00%
Net Sales [Member] | Five Largest Customers [Member] | Asia and Latin America [Member]
Product Information [Line Items]
Concentration Risk Percentage	12.00%
Net Sales [Member] | Five Largest Customers [Member] | Pet [Member]
Product Information [Line Items]
Concentration Risk Percentage	64.00%
Net Sales [Member] | No Customer Other Than Walmart [Member] | Maximum [Member]
Product Information [Line Items]
Concentration Risk Percentage	10.00%
Accounts Receivable [Member] | Walmart [Member] | North America Retail [Member]
Product Information [Line Items]
Concentration Risk Percentage	22.00%
Accounts Receivable [Member] | Walmart [Member] | Convenience Stores and Foodservice Segment [Member]
Product Information [Line Items]
Concentration Risk Percentage	6.00%
Accounts Receivable [Member] | Walmart [Member] | Europe and Australia [Member]
Product Information [Line Items]
Concentration Risk Percentage	1.00%
Accounts Receivable [Member] | Walmart [Member] | Asia and Latin America [Member]
Product Information [Line Items]
Concentration Risk Percentage	7.00%
Accounts Receivable [Member] | Walmart [Member] | Pet [Member]
Product Information [Line Items]
Concentration Risk Percentage	9.00%