Income Taxes (Schedule of the reconcilation of the effective income tax rate) (Details)	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Effective Income Tax Rate Reconciliation [Abstract]
United States statutory rate	29.40%	35.00%	35.00%
State and local income taxes, net of federal tax benefits	1.70%	0.80%	0.70%
Foreign rate differences	(2.00%)	(3.50%)	(2.20%)
Provisional net tax benefit	(24.50%)	0.00%	0.00%
Non-deductible goodwill	0.00%	0.00%	2.60%
Stock based compensation	(1.20%)	0.00%	0.00%
Prior period tax adjustment	1.90%	0.00%	0.00%
Domestic manufacturing deduction	(1.90%)	(2.80%)	(2.00%)
Other, net	(0.70%)	(0.70%)	(2.70%)	[1]
Effective income tax rate	2.70%	28.80%	31.40%
General Mills de Venezuela CA Subsidiary [Member]
Divestitures [Line Items]
Effective income tax rate reconciliation, tax benefit related to divestiture			(0.60%)

[1] Fiscal 2016 includes 0.6 percent tax benefit related to the divestiture of our business in Venezuela. Please s ee Note 3 for additional information