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Benefit Plans Schedule of Net Benefit Costs (Tables)
 3 Months Ended
Nov. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs of Assumptions Used
 
Three Months Ended November 30,
 
Qualified
Pension Benefits
 
Nonqualified
Pension Benefits
 
Other Benefits
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit costs:
 (Dollars in thousands)
Service cost
$
10,538

 
$
9,648

 
$
101

 
$
78

 
$
262

 
$
263

Interest cost
5,431

 
7,099

 
107

 
187

 
187

 
274

Expected return on assets
(11,671
)
 
(11,242
)
 
—

 
—

 
—

 
—

Prior service cost (credit) amortization
45

 
42

 
(28
)
 
(19
)
 
(111
)
 
(139
)
Actuarial loss (gain) amortization
5,396

 
3,087

 
25

 
—

 
(348
)
 
(407
)
Net periodic benefit cost
$
9,739

 
$
8,634

 
$
205

 
$
246

 
$
(10
)
 
$
(9
)