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Business Segment Information (Schedule of financial information by geographic area) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 31, 2020	Feb. 23, 2020	Nov. 24, 2019	Aug. 25, 2019	May 26, 2019	Feb. 24, 2019	Nov. 25, 2018	Aug. 26, 2018	May 31, 2020	May 26, 2019	May 27, 2018	May 28, 2017	May 29, 2016
Segment Reporting Information [Line Items]
Net sales	$ 5,023.0	$ 4,180.3	$ 4,420.8	$ 4,002.5	$ 4,161.7	$ 4,198.3	$ 4,411.2	$ 4,094.0	$ 17,626.6	$ 16,865.2	$ 15,740.4
Cash and cash equivalents	1,677.8				450.0				1,677.8	450.0	399.0	$ 766.1	$ 766.1
Land, buildings, and equipment	3,580.6				3,787.2				3,580.6	3,787.2
United States [Member]
Segment Reporting Information [Line Items]
Net sales									13,364.5	12,462.8	11,115.6
Cash and cash equivalents	1,112.0				51.0				1,112.0	51.0
Land, buildings, and equipment	2,761.6				2,872.8				2,761.6	2,872.8
Non-United States [Member]
Segment Reporting Information [Line Items]
Net sales									4,262.1	4,402.4	$ 4,624.8
Cash and cash equivalents	565.8				399.0				565.8	399.0
Land, buildings, and equipment	$ 819.0				$ 914.4				$ 819.0	$ 914.4