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Retirement Benefit Plans | 6 Months Ended
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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.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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