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Note 12 - Pension and Postretirement Benefits - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 28, 2022 | Aug. 29, 2021
Pension Plan [Member] |  |
Service cost | $ 1.6 | $ 2.7
Interest cost | 31.0 | 20.8
Expected return on plan assets | (36.5) | (36.4)
Amortization of prior service cost | 0.4 | 0.5
Total pension and postretirement cost (benefit) | (1.3) | (10.5)
Pension Plan [Member] | Company Plans [Member] |  |
Total pension and postretirement cost (benefit) | (3.5) | (12.4)
Pension Plan [Member] | Multi Employer Plans [Member] |  |
Total pension and postretirement cost (benefit) | 2.2 | 1.9
Other Postretirement Benefits Plan [Member] |  |
Interest cost | 0.5 | 0.3
Amortization of prior service cost | (0.4) | (0.5)
Total pension and postretirement cost (benefit) | (1.0) | (1.0)
Recognized net actuarial gain | $ (1.1) | $ (0.8)

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