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Benefit Plans Schedule of Net Benefit Costs (Tables)
 6 Months Ended
Feb. 28, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs of Assumptions Used
 
Qualified
Pension Benefits
 
Non-Qualified
Pension Benefits
 
Other Benefits
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Components of net periodic benefit costs for the three months ended February 28 are as follows:
 (Dollars in thousands)
  Service cost
$
9,920

 
$
11,692

 
$
137

 
$
344

 
$
236

 
$
227

  Interest cost
5,991

 
3,812

 
178

 
70

 
227

 
39

  Expected return on assets
(12,049
)
 
(12,101
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
360

 
368

 
7

 
(47
)
 
(142
)
 
(253
)
  Actuarial (gain) loss amortization
4,511

 
6,650

 
16

 
100

 
(306
)
 
(283
)
Net periodic benefit cost
$
8,733

 
$
10,421

 
$
338

 
$
467

 
$
15

 
$
(270
)
Components of net periodic benefit costs for the six months ended February 28 are as follows:
 
  Service cost
$
19,839

 
$
21,075

 
$
274

 
$
603

 
$
472

 
$
580

  Interest cost
11,992

 
11,504

 
356

 
422

 
454

 
466

  Expected return on assets
(24,089
)
 
(24,115
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
719

 
770

 
15

 
10

 
(283
)
 
(283
)
  Actuarial (gain) loss amortization
11,399

 
11,415

 
30

 
273

 
(612
)
 
(399
)
Net periodic benefit cost
$
19,860

 
$
20,649

 
$
675

 
$
1,308

 
$
31

 
$
364