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Risk Management Activities (Tables)
9 Months Ended
Feb. 24, 2019
Risk Management Activities [Abstract]  
Schedule of unallocated corporate items [Table Text Block]
Quarter EndedNine-MonthPeriod Ended
In MillionsFeb. 24, 2019Feb. 25, 2018Feb. 24, 2019Feb. 25, 2018
Net gain (loss) on mark-to-market valuation of certain commodity positions$10.2$0.3$(26.8)$(8.1)
Net loss (gain) on commodity positions reclassified from unallocated corporate items to segment operating profit0.84.6(0.7)10.7
Net mark-to-market revaluation of certain grain inventories(4.5)(7.7)(8.9)0.9
Net mark-to-market valuation of certain commodity positions recognized in unallocated corporate items$6.5$(2.8)$(36.4)$3.5