Benefit Plans Schedule of Net Benefit Costs (Tables)

9 Months Ended

May 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs of Assumptions Used

	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