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Pension Plans (Tables)
 3 Months Ended
Aug. 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic pension cost recognized in other comprehensive income for the Pension Plan are as follows:
 
 
Three Months Ended
(In thousands)
 
August 31,
 2018
 
August 31,
 2017
 
 
 
 
 
Interest cost
 
$
781

 
$
711

Expected return on assets
 
(721
)
 
(716
)
Total net periodic pension cost (benefit)
 
$
60

 
$
(5
)