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Benefit Plans Schedule of Net Benefit Costs (Tables)
 6 Months Ended
Feb. 28, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs of Assumptions Used
 
Qualified
Pension Benefits
 
Non-Qualified
Pension Benefits
 
Other Benefits
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit costs for the three months ended February 28 are as follows:
 (Dollars in thousands)
  Service cost
$
9,648

 
$
9,920

 
$
78

 
$
137

 
$
263

 
$
236

  Interest cost
7,099

 
5,991

 
187

 
178

 
274

 
227

  Expected return on assets
(11,242
)
 
(12,049
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
42

 
360

 
(19
)
 
7

 
(139
)
 
(142
)
  Actuarial (gain) loss amortization
3,087

 
4,511

 
1

 
16

 
(407
)
 
(306
)
  Settlement (gain) loss
169

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost
$
8,803

 
$
8,733

 
$
247

 
$
338

 
$
(9
)
 
$
15

Components of net periodic benefit costs for the six months ended February 28 are as follows:
 
  Service cost
$
19,296

 
$
19,839

 
$
155

 
$
274

 
$
527

 
$
472

  Interest cost
14,198

 
11,992

 
374

 
356

 
547

 
454

  Expected return on assets
(22,484
)
 
(24,089
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
85

 
719

 
(37
)
 
15

 
(278
)
 
(283
)
  Actuarial (gain) loss amortization
6,174

 
11,399

 
1

 
30

 
(814
)
 
(612
)
  Settlement (gain) loss
169

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost
$
17,438

 
$
19,860

 
$
493

 
$
675

 
$
(18
)
 
$
31