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Benefit Plans Schedule of Net Benefit Costs (Tables)
 9 Months Ended
May 31, 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 May 31 are as follows:
 (Dollars in thousands)
  Service cost
$
9,648

 
$
9,920

 
$
78

 
$
137

 
$
263

 
$
236

  Interest cost
7,099

 
5,997

 
186

 
177

 
274

 
227

  Expected return on assets
(11,242
)
 
(12,044
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
42

 
360

 
(19
)
 
7

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

 
4,905

 
1

 
16

 
(407
)
 
(306
)
Net periodic benefit cost
$
8,634

 
$
9,138

 
$
246

 
$
337

 
$
(9
)
 
$
15

Components of net periodic benefit costs for the nine months ended May 31 are as follows:
 
  Service cost
$
28,944

 
$
29,758

 
$
233

 
$
411

 
$
790

 
$
707

  Interest cost
21,297

 
17,988

 
560

 
533

 
821

 
681

  Expected return on assets
(33,726
)
 
(36,133
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
127

 
1,078

 
(56
)
 
23

 
(417
)
 
(424
)
  Actuarial (gain) loss amortization
9,261

 
16,304

 
2

 
46

 
(1,221
)
 
(918
)
  Settlement (gain) loss
169

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost
$
26,072

 
$
28,995

 
$
739

 
$
1,013

 
$
(27
)
 
$
46