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Benefit Plans Schedule of Net Benefit Costs (Tables)
 9 Months Ended
May 31, 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 May 31 are as follows:
 (Dollars in thousands)
  Service cost
$
9,383

 
$
8,889

 
$
258

 
$
206

 
$
353

 
$
188

  Interest cost
7,691

 
7,003

 
352

 
357

 
427

 
288

  Expected return on assets
(12,013
)
 
(12,431
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
402

 
407

 
57

 
57

 
(30
)
 
(30
)
  Actuarial (gain) loss amortization
4,765

 
4,916

 
172

 
272

 
(116
)
 
(342
)
Net periodic benefit cost
$
10,228

 
$
8,784

 
$
839

 
$
892

 
$
634

 
$
104

Components of net periodic benefit costs for the nine months ended May 31 are as follows:
 

 
 

 
 

 
 

 
 

 
 

  Service cost
$
28,149

 
$
27,005

 
$
776

 
$
656

 
$
1,059

 
$
1,134

  Interest cost
23,075

 
21,019

 
1,055

 
1,061

 
1,282

 
1,118

  Expected return on assets
(36,040
)
 
(37,305
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
1,205

 
1,223

 
171

 
171

 
(90
)
 
(90
)
  Actuarial (gain) loss amortization
14,294

 
14,724

 
518

 
794

 
(348
)
 
(553
)
Net periodic benefit cost
$
30,683

 
$
26,666

 
$
2,520

 
$
2,682

 
$
1,903

 
$
1,609