Risk Management Activities - Schedule of Unallocated Corporate Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 22, 2026	Feb. 23, 2025	Feb. 22, 2026	Feb. 23, 2025
Investments, All Other Investments [Abstract]
Net gain (loss) on mark-to-market valuation of certain commodity positions	$ 14.7	$ 16.0	$ 9.4	$ (18.3)
Net loss on commodity positions reclassified from unallocated corporate items to segment operating profit	1.8	7.3	1.6	43.6
Net mark-to-market revaluation of certain grain inventories	0.7	(0.1)	1.7	(1.5)
Net mark-to-market valuation of certain commodity positions recognized in unallocated corporate items	$ 17.2	$ 23.2	$ 12.7	$ 23.8