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Employee Benefit Plans - Schedule of net periodic costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2023 | Nov. 30, 2022 | Nov. 30, 2023 | Nov. 30, 2022
Pension Plans | Foreign Plan |  |  |  |
Components of net periodic benefit (credit) cost: |  |  |  |
Interest cost | $ 300 | $ 200 | $ 700 | $ 500
Expected return on assets | (300) | (300) | (600) | (600)
Net amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of (gain) loss | 300 | 100 | 600 | 200
Net periodic benefit (credit) cost | 300 | 0 | 700 | 100
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)

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