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Retirement Plans (Tables)
9 Months Ended
Feb. 29, 2016
Retirement Plan (Tables) [Abstract]  
Schedule of Retirement Plan Costs
  Three Months Ended Nine Months Ended
  2016 2015 2016 2015
Defined benefit pension plans$ 53 $ (10) $ 160 $ (27)
Defined contribution plans  104   96   304   284
Postretirement healthcare plans  20   21   61   61
  $ 177 $ 107 $ 525 $ 318
Schedule of Net Periodic Benefit Cost
  Three Months Ended Nine Months Ended
Pension Plans2016 2015 2016 2015
 Service cost$ 166 $ 165 $ 497 $ 493
 Interest cost  295   274   885   824
 Expected return on plan assets  (377)   (420)   (1,131)   (1,260)
 Amortization of prior service credit and other  (31)   (29)   (91)   (84)
  $ 53 $ (10) $ 160 $ (27)
             
             
  Three Months Ended Nine Months Ended
Postretirement Healthcare Plans2016 2015 2016 2015
 Service cost$ 10 $ 10 $ 30 $ 30
 Interest cost  10   11   31   31
  $ 20 $ 21 $ 61 $ 61
Schedule of Pension Plans Contributions
  2016 2015 
Required$ 8 $ 380 
Voluntary  487   115 
  $ 495 $ 495