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Retirement Benefit Plans | 6 Months Ended
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Dec. 31, 2018
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,
|  | 2017 |  | 2018 |  | 2017 |  | 2018
Service cost |  | $ | 216 |  | $ | 98 |  | $ | 432 |  | $ | 196
Interest cost |  |  | 8 |  |  | 8 |  |  | 16 |  |  | 16
Amortization of prior service cost |  |  | 70 |  |  | 14 |  |  | 140 |  |  | 28
Net periodic pension expense |  | $ | 294 |  | $ | 120 |  | $ | 588 |  | $ | 240
For the three months ended December 31, 2017, we made no contributions to these defined benefit plans. For the three months ended December 31, 2018, we made contributions of $1.0 million to these defined benefit plans. For each of the six months ended December 31, 2017 and 2018, we made contributions of $1.0 million to these defined benefit plans. We also maintain various defined contribution plans. For the three months ended December 31, 2017 and 2018, we made contributions of $1.4 million and $1.3 million , respectively, to these defined contribution plans. For the six months ended December 31, 2017 and 2018, we made contributions of $3.0 million and $3.1 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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