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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2021 | Aug. 31, 2020
Statement Of Income And Comprehensive Income [Abstract] |  |
Foreign currency translation adjustments, Tax | $ 2,337 | $ 2,862
Pension and other postretirement benefit liability adjustments, Tax | 1,466 | 786
Unrealized gain on securities and other, Tax | 145 | 82
Unrealized gain (loss) on derivatives, Tax | $ 2,571 | $ 5,542

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