Retirement Benefits and Postemployment Benefits (Schedule of assumptions used to determine benefit obligations) (Details)	May 29, 2016	May 31, 2015
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	4.19%	4.38%
Rate of salary increases	4.28%	4.09%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	3.97%	4.20%
Rate of salary increases	0.00%	0.00%
Postemployment Benefit Plans [Member]
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	2.94%	3.55%
Rate of salary increases	4.35%	4.36%