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Pension Plans (Tables)
 6 Months Ended
Nov. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost are summarized as follows:
 
Three Months Ended
 
Six Months Ended
(In thousands)
November 30, 2019
 
November 30, 2018
 
November 30, 2019
 
November 30, 2018
 
 
 
 
 
 
 
 
Interest cost
$
721

 
$
781

 
$
1,441

 
$
1,562

Expected return on assets
(741
)
 
(720
)
 
(1,481
)
 
(1,441
)
Net periodic benefit cost
$
(20
)
 
$
61

 
$
(40
)
 
$
121