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Pension Plans (Tables)
6 Months Ended
Mar. 31, 2020
Pension Plans  
Components of net periodic pension cost (benefit)

The components of net periodic pension cost (benefit) are as follows (in thousands):

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Three Months Ended

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Six Months Ended

 

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March 31,

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March 31,

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2020

    

2019

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2020

    

2019

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Service cost

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$

164

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$

150

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$

329

​

$

299

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Interest cost

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1,507

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1,921

​

 

3,038

​

 

3,831

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Expected return on plan assets

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(2,946)

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(3,034)

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(5,892)

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(6,043)

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Amortization of actuarial loss

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968

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534

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1,969

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1,062

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Administrative expenses

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83

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97

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169

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194

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Net pension benefit

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$

(224)

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$

(332)

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$

(387)

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$

(657)

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