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Employee Benefit Plans - Schedule of net periodic costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2024
Nov. 30, 2023
Pension Plans | Foreign Plan        
Components of net periodic benefit (credit) cost:        
Interest cost $ 200 $ 300 $ 600 $ 700
Expected return on assets (200) (300) (500) (600)
Net amortization of prior service credit 0 0 0 0
Amortization of (gain) loss 400 300 700 600
Net periodic benefit (credit) cost 400 300 800 700
Post-Retirement Benefits        
Components of net periodic benefit (credit) cost:        
Interest cost 100 100 200 200
Expected return on assets 0 0 0 0
Net amortization of prior service credit (200) (200) (400) (400)
Amortization of (gain) loss (0) (0) (0) (0)
Net periodic benefit (credit) cost $ (100) $ (100) $ (200) $ (200)