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Pension Plans (Tables)
 3 Months Ended
Aug. 31, 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 for the three months ended August 31, 2017 are as follows:
(in thousands)
 
August 31, 2017
Interest cost
 
$
711

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

Total net periodic benefit cost
 
$
(5
)