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Pension Plans (Tables)
 6 Months Ended
Nov. 30, 2017
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
 
Six Months Ended
(In thousands)
November 30,
 2017
 
November 30,
 2017
 
 
 
 
Interest cost
$
711

 
$
1,421

Expected return on assets
(716
)
 
(1,432
)
Amortization of net loss
—

 
—

Total net periodic benefit cost
$
(5
)
 
$
(11
)