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Employee Benefit Plans (Details) - Pension Plan - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 28, 2020
Nov. 30, 2019
Nov. 28, 2020
Nov. 30, 2019
Defined Benefit Plan Disclosure        
Interest cost $ 0.7 $ 0.6 $ 1.3 $ 1.2
Expected return on plan assets (1.4) (1.1) (2.8) (2.2)
Net amortization loss 1.6 0.9 3.3 1.7
Net periodic benefit cost $ 0.9 $ 0.4 $ 1.8 $ 0.7