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Pension Plans (Tables)
 6 Months Ended
Nov. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic pension cost (benefit) recognized in other comprehensive income for the Pension Plan are as follows:
 
Three Months Ended
 
Six Months Ended
(In thousands)
November 30, 2018
 
November 30, 2017
 
November 30, 2018
 
November 30, 2017
 
 
 
 
 
 
 
 
Interest cost
$
781

 
$
711

 
$
1,562

 
$
1,421

Expected return on assets
(720
)
 
(716
)
 
(1,441
)
 
(1,432
)
Total net periodic pension cost (benefit)
$
61

 
$
(5
)
 
$
121

 
$
(11
)