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Retirement Benefit Plans | 6 Months Ended
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Dec. 31, 2016
Retirement Benefit Plans |
Retirement Benefit Plans | 8. Retirement Benefit Plans The Company sponsors various retirement benefit plans including qualified and nonqualified defined benefit pension plans for its employees. The components of net periodic pension expense are as follows (in thousands):
|  | Three Months Ended December 31, |  | Six Months Ended December 31, |
|  | 2015 |  | 2016 |  | 2015 |  | 2016 |
Service cost |  | $ | 212 |  | $ | 224 |  | $ | 425 |  | $ | 448 |
Interest cost |  | 8 |  | 7 |  | 17 |  | 14 |
Amortization of prior service cost |  | 105 |  | 70 |  | 210 |  | 140 |
Net periodic pension expense |  | $ | 325 |  | $ | 301 |  | $ | 652 |  | $ | 602 |
For the three months ended December 31, 2015 and 2016, the Company made contributions of $0.2 million and $1.0 million, respectively, to these defined benefit plans. For the six months ended December 31, 2015 and 2016, the Company made contributions of $0.2 million and $1.0 million, respectively, to these defined benefit plans. In addition, the Company maintains various defined contribution plans. For the three months ended December 31, 2015 and 2016, the Company made contributions of $1.2 million and $1.0 million, respectively, to these defined contribution plans. For the six months ended December 31, 2015 and 2016, the Company made contributions of $2.3 million and $2.2 million, respectively, to these defined contribution plans.

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