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Pension Plans (Tables)
3 Months Ended
Aug. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost are summarized as follows:
 
Three Months Ended
(In thousands)
August 31, 2019
 
August 31, 2018
 
 
 
 
Interest cost
$
720

 
$
781

Expected return on assets
(740
)
 
(721
)
Net periodic benefit cost
$
(20
)
 
$
60