Restructuring Initiatives (Narrative) (Details) $ in Millions	3 Months Ended			6 Months Ended		15 Months Ended	21 Months Ended		24 Months Ended	36 Months Ended		48 Months Ended
	Feb. 28, 2016 USD ($)	Nov. 29, 2015 USD ($)	Nov. 23, 2014 USD ($)	Nov. 29, 2015 USD ($)	Nov. 23, 2014 USD ($)	Nov. 29, 2015 USD ($) positions	May. 28, 2017 USD ($) positions	May. 29, 2016 USD ($) positions	May. 28, 2017 USD ($) positions	May. 27, 2018 USD ($) positions	May. 28, 2017 USD ($) positions	May. 26, 2019 USD ($) positions
Restructuring and Related Cost [Line Items]
Net restructuring charges		$ 83.1	$ 233.2	$ 165.0	$ 247.2
Cash payments				75.2
Severance expense		28.0	166.0	75.4	179.1
Other charges, primarily fixed asset write-offs		10.1	32.6	12.5	33.3
Project-related costs classified in cost of sales		16.2	0.0	29.3	0.0
Q1 2016 Project Compass [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		2.1	0.0	53.6	0.0
Severance expense		2.2	0.0	47.1	0.0
Other charges, primarily fixed asset write-offs		0.0	0.0	0.0	0.0
Q2 2015 Project Century [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		81.0	88.9	111.2	88.9
Severance expense		25.8	21.7	28.1	21.7
Other charges, primarily fixed asset write-offs		10.1	32.6	12.5	32.6
Charges Related to Project Century Restructuring Actions Previously Announced [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		2.5	18.4	6.8	18.4
Q2 2015 Project Catalyst [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions						800
Net restructuring charges		0.0	145.0	0.2	145.0	$ 149.0
Cash payments						$ 118.0
Severance expense		0.0	145.0	0.2	145.0
Other charges, primarily fixed asset write-offs		0.0	0.0	0.0	0.0
Q1 2015 Combination of Certain Operational Facilities [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		0.0	(0.1)	0.0	13.9
Severance expense		0.0	(0.1)	0.0	13.0
Other charges, primarily fixed asset write-offs		0.0	0.0	0.0	0.7
U.S. Retail and Convenience Stores and Foodservice Segments [Member] | Q2 2015 Project Century, Exit Methuen Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		3.3	25.7	15.2	25.7
U.S. Retail [Member] | Q1 2016 Project Century, Exit West Chicago Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		64.0		64.0
U.S. Retail [Member] | Q1 2016 Project Century, Exit Joplin Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		2.9		7.8
U.S. Retail [Member] | Q2 2015 Project Century, Exit Lodi Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		7.9	$ 44.8	17.0	$ 44.8
International [Member] | Q1 2016 Project Compass [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		2.1		$ 53.6
International [Member] | Q2 2016 Project Century, Exit East Tamaki Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		$ 0.4
Forecast [Member]
Restructuring and Related Cost [Line Items]
Project-related costs classified in cost of sales												$ 105.0
Forecast [Member] | U.S. Retail and Convenience Stores and Foodservice Segments [Member] | Q2 2015 Project Century, Exit Methuen Facility [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions								250
Net restructuring charges								$ 65.0
Cash payments								$ 14.0
Forecast [Member] | U.S. Retail [Member] | Q1 2016 Project Century, Exit West Chicago Facility [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions												500
Net restructuring charges												$ 123.0
Cash payments												$ 55.0
Forecast [Member] | U.S. Retail [Member] | Q1 2016 Project Century, Exit Joplin Facility [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions										120
Net restructuring charges										$ 12.0
Cash payments										$ 5.0
Forecast [Member] | U.S. Retail [Member] | Q2 2015 Project Century, Exit Lodi Facility [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions								430
Net restructuring charges								$ 102.0
Cash payments								$ 38.0
Forecast [Member] | International [Member] | Q1 2016 Project Compass [Member]
Restructuring and Related Cost [Line Items]
Cash payments									$ 61.0
Forecast [Member] | International [Member] | Q1 2016 Project Compass [Member] | Minimum Member
Restructuring and Related Cost [Line Items]
Number of positions affected | positions									725
Net restructuring charges									$ 62.0
Forecast [Member] | International [Member] | Q1 2016 Project Compass [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions									775
Net restructuring charges									$ 65.0
Forecast [Member] | International [Member] | Q2 2016 Project Century, Exit Berwick Facility [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions							265
Cash payments							$ 21.0
Severance expense							10.0
Forecast [Member] | International [Member] | Q2 2016 Project Century, Exit Berwick Facility [Member] | Minimum Member
Restructuring and Related Cost [Line Items]
Net restructuring charges	$ 24.0						46.0
Other charges, primarily fixed asset write-offs							36.0
Forecast [Member] | International [Member] | Q2 2016 Project Century, Exit Berwick Facility [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	$ 29.0						51.0
Other charges, primarily fixed asset write-offs							$ 41.0
Forecast [Member] | International [Member] | Q2 2016 Project Century, Exit East Tamaki Facility [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions							20
Forecast [Member] | International [Member] | Q2 2016 Project Century, Exit East Tamaki Facility [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges							$ 1.0
Forecast [Member] | International [Member] | Q1 2015 Combination of Certain Operational Facilities [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions											240
Net restructuring charges											$ 15.0
Cash payments											$ 12.0