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Retirement Benefits and Postemployment Benefits (Schedule of summarized financial information about benefit plans) (Parenthetical) (Details)
12 Months Ended
May 30, 2021
May 31, 2020
Retirement Benefits and Postemployment Benefits [Abstract]    
Defined Benefit Plan, Plan Assets, Accounting Policy Election, Measurement Date May 31, 2021 May 31, 2020