SEGMENTS - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2024	Feb. 26, 2023	Feb. 25, 2024	Feb. 26, 2023	Jul. 05, 2022	May 29, 2022
Segment Adjusted EBITDA
Depreciation and amortization	$ 80.0	$ 59.5	$ 222.0	$ 176.9
Unrealized derivative losses	27.3	5.1	1.6	8.7
Unconsolidated joint venture unrealized derivative losses	0.0	47.1	0.0	32.7
Foreign currency exchange losses	9.0	1.8	7.3	4.2
Inventory step-up from acquisition	0.0	0.0	20.7	0.0
Integration and acquisition-related items, net	2.4	(4.3)	11.2	(30.8)
Gain on acquisition of interest in joint ventures	0.0	0.0	0.0	(15.1)
Interest expense, net	35.7	25.8	95.5	76.4
Income before income taxes	189.2	217.2	775.1	662.7
Income tax expense	43.1	42.1	179.3	152.6
Net income	146.1	175.1	595.8	510.1
Write-off of excess raw potatoes	25.0		95.9
Write-off of excess raw potatoes, after tax	$ 19.0		$ 72.9
Inventory Write-down, after Tax, Per Share Increase (Decrease)	$ (0.13)		$ 0.50
Interest expense, income tax expense, and depreciation and amortization from equity method investments	$ 2.1	9.3	$ 6.4	26.9
Business combination, step acquisition, equity interest in acquiree, remeasurement gain (loss), after tax				15.1
Lamb Weston Alimentos Modernos S.A. ("LWAMSA")
Segment Adjusted EBITDA
Business acquisition, percentage of voting interests acquired (as a percent)					40.00%
Lamb-Weston Meijer v.o.f. ("LW EMEA")
Segment Adjusted EBITDA
Equity method investment, ownership interest (as a percent)						50.00%
Lamb Weston Alimentos Modernos S.A. ("LWAMSA")
Segment Adjusted EBITDA
Equity method investment, ownership interest (as a percent)						50.00%
North America
Segment Adjusted EBITDA
Write-off of excess raw potatoes	22.7		86.0
International
Segment Adjusted EBITDA
Write-off of excess raw potatoes	2.3		9.9
Operating Segments
Segment Adjusted EBITDA
Adjusted EBITDA	387.6	387.1	1,278.1	1,011.8
Operating Segments | North America
Segment Adjusted EBITDA
Adjusted EBITDA	285.9	333.0	986.6	864.4
Operating Segments | International
Segment Adjusted EBITDA
Adjusted EBITDA	101.7	54.1	291.5	147.4
Corporate, Non-Segment
Segment Adjusted EBITDA
Adjusted EBITDA	$ (44.0)	$ (34.9)	$ (144.7)	$ (96.1)