Restructuring, Impairment, and Other Exit Costs (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	May 27, 2018 USD ($)	May 27, 2018 USD ($) positions	May 28, 2017 USD ($) positions	May 29, 2016 USD ($)
RESTRUCTURING, IMPAIRMENT, AND OTHER EXIT COSTS [Abstract]
Impairment charge	$ 96.9	$ 96.9	$ 0.0
Restructuring and Related Cost [Line Items]
Restructuring charges (reversal)		82.7	224.1	$ 229.8
Cash payments for restructuring		53.6	107.8	122.6
Payments for other project related costs		10.9	46.9	54.5
Expected additional project-related costs		$ 130.0
Q4 2018 Global Cost Savings Initiatives [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		May 27, 2018
Restructuring action completion date		May 26, 2019
Number of positions affected | positions		625
Expected net expense of restructuring action	55.0	$ 55.0
Restructuring charges (reversal)		$ 49.3
Q3 2017 Organizational Restructuring Realignment [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		Feb. 26, 2017
Restructuring action completion date		May 27, 2018
Number of positions affected | positions		600
Actual restructuring costs incurred to date	69.9	$ 69.9
Restructuring charges (reversal)		(2.2)	72.1
Q2 2017 Melbourne Pasta Manufacturing Facility Closure [Member]
Restructuring and Related Cost [Line Items]
Restructuring charges (reversal)		$ 15.7	21.9
Q2 2017 Melbourne Pasta Manufacturing Facility Closure [Member] | Europe and Australia [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		Nov. 27, 2016
Restructuring action completion date		May 26, 2019
Number of positions affected | positions		350
Expected net expense of restructuring action	40.0	$ 40.0
Restructuring charges (reversal)		15.7	21.9
Q1 2017 Certain Product Lines Restructuring [Member]
Restructuring and Related Cost [Line Items]
Restructuring charges (reversal)		$ (0.1)	45.1
Q1 2017 Certain Product Lines Restructuring [Member] | Asia and Latin America [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		Aug. 28, 2016
Restructuring action completion date		May 26, 2019
Expected net expense of restructuring action	46.0	$ 46.0
Restructuring charges (reversal)		$ (0.1)	45.1
Q1 2017 Brazilian Facilities Restructuring [Member] | Asia and Latin America [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions		420
Q1 2017 China Facilities Restructuring [Member] | Asia and Latin America [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions		440
Q1 2017 Vineland Facility Closure [Member]
Restructuring and Related Cost [Line Items]
Restructuring charges (reversal)		$ 12.8	41.4
Q1 2017 Vineland Facility Closure [Member] | North America 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		380
Expected net expense of restructuring action	54.0	$ 54.0
Expected cash payments for restructuring		11.0
Restructuring charges (reversal)		$ 12.8	41.4
Q1 2016 Project Compass [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		Aug. 30, 2015
Restructuring action completion date		May 27, 2018
Number of positions affected | positions		749
Actual restructuring costs incurred to date	54.7	$ 54.7
Restructuring charges (reversal)		$ 0.4	(0.4)	54.7
Q2 2015 Project Century [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		May 31, 2015
Restructuring charges (reversal)		$ 7.8	$ 44.0	182.6
Q2 2016 Project Century, Exit Berwick and East Tamaki Facilities [Member] | Europe and Australia [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			287
Actual restructuring costs incurred to date			$ 31.8
Actual cash payments for restructuring paid to date			12.0
Restructuring charges (reversal)			1.8	30.0
Q1 2016 Project Century, Exit West Chicago Facility [Member] | North America Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		Aug. 30, 2015
Restructuring action completion date		May 27, 2018
Number of positions affected | positions		484
Actual restructuring costs incurred to date	109.3	$ 109.3
Actual cash payments for restructuring paid to date		21.0
Restructuring charges (reversal)		$ 6.9	23.2	79.2
Q1 2016 Project Century, Exit Joplin Facility [Member] | North America Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date		Aug. 30, 2015
Restructuring action completion date		May 27, 2018
Number of positions affected | positions		125
Actual restructuring costs incurred to date	$ 8.0	$ 8.0
Restructuring charges (reversal)		1.4	$ 0.3	$ 6.3
Q1 2016 Project Century, Exit Joplin Facility [Member] | North America Retail [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Actual cash payments for restructuring paid to date		$ 1.0