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Business Segment Information (Schedule of net sales by class of similar products) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 30, 2021	Feb. 28, 2021	Nov. 29, 2020	Aug. 30, 2020	May 31, 2020	Feb. 23, 2020	Nov. 24, 2019	Aug. 25, 2019	May 30, 2021	May 31, 2020	May 26, 2019
Product Information [Line Items]
Net sales	$ 4,523.6	$ 4,520.0	$ 4,719.4	$ 4,364.0	$ 5,023.0	$ 4,180.3	$ 4,420.8	$ 4,002.5	$ 18,127.0	$ 17,626.6	$ 16,865.2
Snacks [Member]
Product Information [Line Items]
Net sales									3,574.2	3,529.7	3,487.4
Convenient meals [Member]
Product Information [Line Items]
Net sales									3,030.2	2,814.3	2,538.6
Cereal [Member]
Product Information [Line Items]
Net sales									2,868.9	2,874.1	2,672.8
Yogurt [Member]
Product Information [Line Items]
Net sales									2,074.8	2,056.6	2,113.1
Dough [Member]
Product Information [Line Items]
Net sales									1,866.1	1,801.1	1,661.9
Pet [Member]
Product Information [Line Items]
Net sales									1,732.4	1,694.6	812.7
Baking mixes and ingredients [Member]
Product Information [Line Items]
Net sales									1,695.5	1,674.2	1,663.7
Super-premium ice cream [Member]
Product Information [Line Items]
Net sales									819.7	718.1	812.7
Vegetables and Other [Member]
Product Information [Line Items]
Net sales									$ 465.2	$ 463.9	$ 484.1

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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