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Retirement Plans (Tables)
6 Months Ended
Nov. 30, 2016
Retirement Plan (Tables) [Abstract]  
Schedule of Retirement Plan Costs
  Three Months Ended Six Months Ended
  2016 2015 2016 2015
Defined benefit pension plans$ 58 $ 54 $ 116 $ 107
Defined contribution plans  112   103   231   205
Postretirement healthcare plans  19   20   38   41
  $ 189 $ 177 $ 385 $ 353
Schedule of Net Periodic Benefit Cost
  Three Months Ended Six Months Ended
Pension Plans2016 2015 2016 2015
 Service cost$ 180 $ 165 $ 360 $ 331
 Interest cost  293   295   586   590
 Expected return on plan assets  (386)   (377)   (772)   (754)
 Amortization of prior service credit and other  (29)   (29)   (58)   (60)
  $ 58 $ 54 $ 116 $ 107
             
             
  Three Months Ended Six Months Ended
Postretirement Healthcare Plans2016 2015 2016 2015
 Service cost$ 9 $ 10 $ 18 $ 20
 Interest cost  10   10   20   21
  $ 19 $ 20 $ 38 $ 41
Schedule of Pension Plans Contributions
  2016 2015 
Required$ 250 $ 8 
Voluntary  250   322 
  $ 500 $ 330