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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, 2019 | May 31, 2018
Domestic |  |
1% Increase (Decrease) in healthcare cost trend rate |  |
1% Increase in trend rate, accumulated benefit obligation | $ 124 | $ 185
1% Increase in trend rate, postretirement cost | 7 | 7
1% Decrease in trend rate, accumulated benefit obligation | (112) | (163)
1% Decrease in trend rate, postretirement cost | (6) | (6)
Non-U.S. Plans |  |
1% Increase (Decrease) in healthcare cost trend rate |  |
1% Increase in trend rate, accumulated benefit obligation | 8,300 | 6,978
1% Increase in trend rate, postretirement cost | 731 | 673
1% Decrease in trend rate, accumulated benefit obligation | (6,390) | (5,391)
1% Decrease in trend rate, postretirement cost | $ (539) | $ (493)

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