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Retirement Benefit Plans

9 Months Ended

Mar. 31, 2020

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 March 31,						Nine Months Ended March 31,
		2019			2020			2019			2020
Service cost		$	98		$	100		$	295		$	300
Interest cost			8			8			25			24
Amortization of prior service cost			14			13			42			39
Net periodic pension expense		$	120		$	121		$	362		$	363

For the three months ended March 31, 2019, we made no contributions to these defined benefit plans. For the nine months ended March 31, 2019, we made contributions of $1.0 million to these defined benefit plans. For the three and nine months ended March 31, 2020, we made no contributions to these defined benefit plans.

We also maintain various defined contribution plans. For the three months ended March 31, 2019 and 2020, we made contributions of $1.6 million and $1.8 million, respectively, to these defined contribution plans. For the nine months ended March 31, 2019 and 2020, we made contributions of $4.7 million and $5.0 million, respectively, to these defined contribution plans.