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Benefit Plans Schedule of Net Benefit Costs (Tables)
 6 Months Ended
Feb. 28, 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 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