Risk Management Activities (Narrative) (Details) $ in Millions	9 Months Ended
	Feb. 24, 2019 USD ($)
Credit Risk [Abstract]
Accounts Payable to Suppliers that Utilize Third Party Service	$ 1,017.5
Commodity Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 229.0
Derivative Contracts Inputs, Average Period of Utilization	12 months
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 101.2
Agricultural Related Derivative [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 127.8