Risk Management Activities - Schedule of Unallocated Corporate Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 23, 2025	Nov. 24, 2024	Nov. 23, 2025	Nov. 24, 2024
Investments, All Other Investments [Abstract]
Net (loss) gain on mark-to-market valuation of certain commodity positions	$ (4.8)	$ 3.4	$ (5.3)	$ (34.3)
Net loss (gain) on commodity positions reclassified from unallocated corporate items to segment operating profit	1.2	19.1	(0.2)	36.3
Net mark-to-market revaluation of certain grain inventories	7.6	6.9	1.0	(1.4)
Net mark-to-market valuation of certain commodity positions recognized in unallocated corporate items	$ 4.0	$ 29.4	$ (4.5)	$ 0.6