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Retirement Benefit Plans
 6 Months Ended
Dec. 31, 2017
Retirement Benefit Plans  
Retirement Benefit Plans

 

8. Retirement Benefit Plans

 

We sponsor various retirement benefit plans including qualified and nonqualified defined benefit pension plans for our employees. The components of net periodic pension expense are as follows (in thousands):

 

 

 

Three Months Ended
December 31,

 

Six Months Ended
December 31,

 

 

 

2016

 

2017

 

2016

 

2017

 

Service cost

 

$
224

 

$
216

 

$
448

 

$
432

 

Interest cost

 
7

 
8

 
14

 
16

 

Amortization of prior service cost

 
70

 
70

 
140

 
140

 

 

 

 

 

 

 

 

 

 

 

Net periodic pension expense

 

$
301

 

$
294

 

$
602

 

$
588

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For the three months ended December 31, 2016 and 2017, we made contributions of $1.0 million and $0.3 million, respectively, to these defined benefit plans. For each of the six months ended December 31, 2016 and 2017, we made contributions of $1.0 million to these defined benefit plans.

 

In addition, we maintain various defined contribution plans. For the three months ended December 31, 2016 and 2017, we made contributions of $1.0 million and $1.4 million, respectively, to these defined contribution plans. For the six months ended December 31, 2016 and 2017, we made contributions of $2.2 million and $3.0 million, respectively, to these defined contribution plans.