Restructuring Initiatives (Narrative) (Details) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Nov. 27, 2016 USD ($)	Nov. 29, 2015 USD ($)	Aug. 30, 2015 USD ($)	Nov. 27, 2016 USD ($) positions	Nov. 29, 2015 USD ($)	May 29, 2016 USD ($) positions
Restructuring and Related Cost [Line Items]
Net restructuring charges	$ 41.8	$ 83.1		$ 114.3	$ 165.0
Cash payments for restructuring				43.3
Payments for other project-related costs	11.9
Expected additional project-related costs				29.5
Q2 2017 Melbourne Pasta Manufacturing Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	12.0	0.0		$ 12.0	0.0
Q2 2017 Melbourne Pasta Manufacturing Facility [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Nov. 27, 2016
Restructuring action completion date				May 27, 2018
Number of positions affected | positions				350
Expected net expense of restructuring action	34.0			$ 34.0
Net restructuring charges	12.0
Q1 2017 Certain International Segment Product Lines [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	6.9	0.0		$ 43.3	0.0
Q1 2017 Certain International Segment Product Lines [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Aug. 28, 2016
Restructuring action completion date				May 28, 2017
Expected net expense of restructuring action	46.0			$ 46.0
Expected cash payments for restructuring				8.0
Net restructuring charges	6.9			$ 43.3
Q1 2017 Brazilian Facilities [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions				420
Q1 2017 China Facilities [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions				440
Q1 2017 Vineland Facility [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	7.0	0.0		$ 27.9	0.0
Q1 2017 Vineland Facility [Member] | U.S. Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Aug. 28, 2016
Restructuring action completion date				May 26, 2019
Number of positions affected | positions				370
Expected net expense of restructuring action	66.0			$ 66.0
Expected cash payments for restructuring				23.0
Net restructuring charges	7.0			27.9
Q1 2016 Project Compass [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	0.0	2.1		$ 1.0	53.6
Q1 2016 Project Compass [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Aug. 30, 2015
Restructuring action completion date				May 28, 2017
Expected net expense of restructuring action	58.0			$ 58.0
Expected cash payments for restructuring				58.0
Net restructuring charges		2.1		$ 1.0	53.6
Q1 2016 Project Compass [Member] | International [Member] | Minimum {Member}
Restructuring and Related Cost [Line Items]
Number of positions affected | positions				725
Q1 2016 Project Compass [Member] | International [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions				775
Q2 2015 Project Century [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				May 31, 2015
Net restructuring charges	15.9	81.0		$ 30.1	111.2
Q2 2016 Project Century, Exit Berwick Facility [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Nov. 29, 2015
Restructuring action completion date				May 27, 2018
Number of positions affected | positions				265
Expected net expense of restructuring action	33.0			$ 33.0
Expected cash payments for restructuring				12.0
Net restructuring charges	0.5			$ 2.0
Q2 2016 Project Century, Exit East Tamaki Facility [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Nov. 29, 2015
Restructuring action completion date				May 28, 2017
Number of positions affected | positions				20
Net restructuring charges					0.4
Q2 2016 Project Century, Exit East Tamaki Facility [Member] | International [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Expected net expense of restructuring action	1.0			$ 1.0
Expected cash payments for restructuring				$ 1.0
Q1 2016 Project Century, Exit West Chicago Facility [Member] | U.S. Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date				Aug. 30, 2015
Restructuring action completion date				May 26, 2019
Number of positions affected | positions				500
Expected net expense of restructuring action	108.0			$ 108.0
Expected cash payments for restructuring				44.0
Net restructuring charges	5.5	64.0		12.9	64.0
Q1 2016 Project Century, Exit Joplin Facility [Member] | U.S. Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date						Aug. 30, 2015
Restructuring action completion date						May 29, 2016
Number of positions affected | positions						120
Net restructuring charges		2.9			7.8	$ 6.6
Q1 2016 Project Century, Exit Joplin Facility [Member] | U.S. Retail [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Cash payments for restructuring			$ 1.0
Charges Related to Project Century Restructuring Actions Previously Announced [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	$ 9.9	$ 13.7		$ 15.2	$ 39.0