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Increasing or Decreasing Current Health Care Cost Trend (Detail) - Postretirement Benefits - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2020 | May 31, 2019
Domestic |  |
1% Increase (Decrease) in healthcare cost trend rate |  |
1% Increase in trend rate, accumulated benefit obligation | $ 130 | $ 124
1% Increase in trend rate, postretirement cost | 4 | 7
1% Decrease in trend rate, accumulated benefit obligation | (117) | (112)
1% Decrease in trend rate, postretirement cost | (3) | (6)
Non-U.S. Plans |  |
1% Increase (Decrease) in healthcare cost trend rate |  |
1% Increase in trend rate, accumulated benefit obligation | 7,452 | 8,300
1% Increase in trend rate, postretirement cost | 814 | 731
1% Decrease in trend rate, accumulated benefit obligation | (5,843) | (6,390)
1% Decrease in trend rate, postretirement cost | $ (595) | $ (539)

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