Retirement Benefit Plans

6 Months Ended

Dec. 31, 2015

7. 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,
	2014		2015		2014		2015
Service cost	$	266	$	212	$	530	$	425
Amortization of prior service cost	202		105		404		210

Net periodic pension expense	$	468	$	317	$	934	$	635

For the three months ended December 31, 2014, there were no contributions made to these defined benefit plans, while the Company made contributions of $0.2 million during the three months ended December 31, 2015. For the six months ended December 31, 2014 and 2015, the Company made contributions of $1.0 million and $0.2 million, respectively, to these defined benefit plans.

In addition, the Company maintains various defined contribution plans. For the three months ended December 31, 2014 and 2015, the Company made contributions of $1.1 million and $1.2 million, respectively, to these defined contribution plans. For the six months ended December 31, 2014 and 2015, the Company made contributions of $2.2 million and $2.3 million, respectively, to these defined contribution plans.