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Retirement Benefit Plans

6 Months Ended

Dec. 31, 2019

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,
		2018			2019			2018			2019
Service cost		$	98		$	100		$	196		$	200
Interest cost			8			8			16			16
Amortization of prior service cost			14			13			28			26
Net periodic pension expense		$	120		$	121		$	240		$	242

For the three and six months ended December 31, 2018, we made contributions of $1.0 million to these defined benefit plans. For the three and six months ended December 31, 2019, we made no contributions to these defined benefit plans.

We also maintain various defined contribution plans. For the three months ended December 31, 2018 and 2019, we made contributions of $1.3 million and $1.4 million, respectively, to these defined contribution plans. For the six months ended December 31, 2018 and 2019, we made contributions of $3.1 million and $3.2 million, respectively, to these defined contribution plans.