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Employee Benefit Plans (Details) - Pension Plan - USD ($)
$ in Millions
3 Months Ended
Aug. 29, 2020
Aug. 31, 2019
Defined Benefit Plan Disclosure    
Interest cost $ 0.7 $ 0.5
Expected return on plan assets (1.4) (1.0)
Net amortization loss 1.6 0.8
Net periodic benefit cost $ 0.9 $ 0.3