Benefit Plans

We have various pension and other defined benefit and defined contribution plans, in which substantially all employees may participate. We also have non-qualified supplemental executive and Board retirement plans.

Components of net periodic benefit costs for the three and nine months ended May 31, 2017, and 2016, are as follows:



	Qualified Pension Benefits						Non-Qualified Pension Benefits				Other Benefits
	2017			2016			2017		2016		2017			2016
Components of net periodic benefit costs for the three months ended May 31 are as follows:	(Dollars in thousands)
Service cost	$	10,537		$	9,383		$	302	$	258	$	290		$	353
Interest cost	5,753			7,691			210		352		232			427
Expected return on assets	(12,058		)	(12,013		)	—		—		—			—
Prior service cost (credit) amortization	385			402			4		57		(141		)	(30		)
Actuarial (gain) loss amortization	5,708			4,765			136		172		(199		)	(116		)
Net periodic benefit cost	$	10,325		$	10,228		$	652	$	839	$	182		$	634
Components of net periodic benefit costs for the nine months ended May 31 are as follows:
Service cost	$	31,612		$	28,149		$	905	$	776	$	870		$	1,059
Interest cost	17,257			23,075			632		1,055		698			1,282
Expected return on assets	(36,173		)	(36,040		)	—		—		—			—
Prior service cost (credit) amortization	1,155			1,205			14		171		(424		)	(90		)
Actuarial (gain) loss amortization	17,123			14,294			409		518		(598		)	(348		)
Net periodic benefit cost	$	30,974		$	30,683		$	1,960	$	2,520	$	546		$	1,903

Employer Contributions

Total contributions to be made during fiscal 2017 will depend primarily on market returns on the pension plan assets and minimum funding level requirements. During the nine months ended May 31, 2017, we made no contributions to the pension plans. At this time, we do not anticipate being required to make a contribution for our benefit plans in fiscal 2017.