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 six months ended February 28, 2017, and February 29, 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 February 28, 2017, and February 29, 2016, are as follows:	(Dollars in thousands)
Service cost	$	11,692		$	9,383		$	344		$	259	$	227		$	353
Interest cost	3,812			7,691			70			351		39			428
Expected return on assets	(12,101		)	(12,013		)	—			—		—			—
Prior service cost (credit) amortization	368			401			(47		)	57		(253		)	(30		)
Actuarial (gain) loss amortization	6,650			4,775			100			173		(283		)	(116		)
Net periodic benefit cost	$	10,421		$	10,237		$	467		$	840	$	(270	)	$	635
Components of net periodic benefit costs for the six months ended February 28, 2017, and February 29, 2016, are as follows:
Service cost	$	21,075		$	18,766		$	603		$	518	$	580		$	706
Interest cost	11,504			15,384			422			703		466			855
Expected return on assets	(24,115		)	(24,027		)	—			—		—			—
Prior service cost (credit) amortization	770			803			10			114		(283		)	(60		)
Actuarial (gain) loss amortization	11,415			9,529			273			346		(399		)	(232		)
Net periodic benefit cost	$	20,649		$	20,455		$	1,308		$	1,681	$	364		$	1,269

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 six months ended February 28, 2017, we made no contributions to the pension plans. At this time, we do not anticipate having to make a required contribution for our benefit plans in fiscal 2017, but we may make a voluntary contribution during the fourth quarter of fiscal 2017.