Benefit Plans Schedule of Net Benefit Costs (Tables)

3 Months Ended

Nov. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs of Assumptions Used

	Qualified Pension Benefits						Non-Qualified Pension Benefits				Other Benefits
	2016			2015			2016		2015		2016			2015
Components of net periodic benefit costs for the three months ended November 30 are as follows:	(Dollars in thousands)
Service cost	$	9,383		$	9,383		$	259	$	259	$	353		$	353
Interest cost	7,692			7,693			352		352		427			427
Expected return on assets	(12,014		)	(12,014		)	—		—		—			—
Prior service cost (credit) amortization	402			402			57		57		(30		)	(30		)
Actuarial (gain) loss amortization	4,765			4,754			173		173		(116		)	(116		)
Net periodic benefit cost	$	10,228		$	10,218		$	841	$	841	$	634		$	634