Risk Management Activities (Narrative) (Details) $ in Millions	3 Months Ended
	Aug. 26, 2018 USD ($)
Credit Risk [Abstract]
Accounts Payable to Suppliers that Utilize Third Party Service	$ 1,010.1
Commodity Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 160.4
Derivative Contracts Inputs, Average Period of Utilization	12 months
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 71.7
Agricultural Related Derivative [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 88.7