Benefit Plans Schedule of Net Benefit Costs (Tables)

6 Months Ended

Feb. 29, 2016

Schedule of Net Periodic Benefit Costs [Abstract]

Schedule of Net Benefit Costs of Assumptions Used [Table Text Block]

	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 February 29, 2016 and February 28, 2015 are as follows:	(Dollars in thousands)
Service cost	$	9,383		$	9,058		$	259	$	225	$	353		$	474
Interest cost	7,691			7,002			351		352		428			415
Expected return on assets	(12,013		)	(12,436		)	—		—		—			—
Prior service cost (credit) amortization	401			409			57		57		(30		)	(30		)
Actuarial (gain) loss amortization	4,775			4,907			173		261		(116		)	(106		)
Net periodic benefit cost	$	10,237		$	8,940		$	840	$	895	$	635		$	753
Components of net periodic benefit costs for the six months ended February 29, 2016 and February 28, 2015 are as follows:
Service cost	$	18,766		$	18,116		$	518	$	450	$	706		$	946
Interest cost	15,384			14,016			703		704		855			830
Expected return on assets	(24,027		)	(24,874		)	—		—		—			—
Prior service cost (credit) amortization	803			816			114		114		(60		)	(60		)
Actuarial (gain) loss amortization	9,529			9,808			346		522		(232		)	(211		)
Net periodic benefit cost	$	20,455		$	17,882		$	1,681	$	1,790	$	1,269		$	1,505